It is possible to abstain from sin for the rest of your life,being led of the Spirit,when you first receive the Spirit,for with God nothing is impossible.
But I doubt it will ever occur,and if it does it would be a rare case,for when people are saved,and receive the Spirit,being babes in Christ,they have a tendency to stumble at that time,for they are babes teetering trying to stand up,and fall down sometimes,but there is a lot of little things we do that is sin,but we do not take them that serious.
All sin can be forgiven,even if a person lives in sin for a year,it can still be forgiven.
If we were sinless then it would not be possible for us to sin,it would be impossible for us to sin,we would not have the capacity to sin,but the Bible says that if we sin after we are saved,we have an advocate with the Father,Jesus Christ,the righteous,so after we are saved,and led by the Spirit,if we desire to sin we can sin,so we cannot be sinless.
But that is us as a human,if we are led by the Spirit we can abstain from sin,and we will not sin,but we as a human are still not sinless,for in the flesh dwells no good thing,so we will always be sinners according to our human nature,but all we have to do is accept ignoring the human nature,and being led of the Spirit,and we can abstain from sin,for the Spirit makes it easier on us to be able to abstain from sin,for God will not allow us to be tempted above measure,and will cause us to escape the temptation,and the Spirit will keep our focus on doing right,and give us a desire to do right,which the world cannot have that power.
You brought up 3 good points,which seem to be about the 3 most common things a Christian will do,that is wrong.
Or, not witnessing to a person when the Holy Spirit prompts you to
Eph 4:30 And grieve not the holy Spirit of God, whereby ye are sealed unto the day of redemption.
Jas 4:13 Go to now, ye that say, To day or to morrow we will go into such a city, and continue there a year, and buy and sell, and get gain:
Jas 4:14 Whereas ye know not what shall be on the morrow. For what is your life? It is even a vapour, that appeareth for a little time, and then vanisheth away.
Jas 4:15 For that ye ought to say, If the Lord will, we shall live, and do this, or that.
Ecc 9:10 Whatsoever thy hand findeth to do, do it with thy might; for there is no work, nor device, nor knowledge, nor wisdom, in the grave, whither thou goest.
Luk 17:20 And when he was demanded of the Pharisees, when the kingdom of God should come, he answered them and said, The kingdom of God cometh not with observation:
Luk 17:21 Neither shall they say, Lo here! or, lo there! for, behold, the kingdom of God is within you.
We do not always do what the Spirit wants us to do,for if we did,the saints would be busy as ants on this planet,laboring for the kingdom of God.
I would say the vast majority would violate this,at one time,or another.
Or, buying an extra fishing rod you don't need or won't use (and you clearly know the Spirit says - "don't buy it!)
Act 2:44 And all that believed were together, and had all things common;
Act 2:45 And sold their possessions and goods, and parted them to all men, as every man had need.
Act 4:34 Neither was there any among them that lacked: for as many as were possessors of lands or houses sold them, and brought the prices of the things that were sold,
Act 4:35 And laid them down at the apostles' feet: and distribution was made unto every man according as he had need.
1Ti 6:7 For we brought nothing into this world, and it is certain we can carry nothing out.
1Ti 6:8 And having food and raiment let us be therewith content.
We tend to like to buy something that is a personal item,instead of giving the money to someone in need,and has nothing to do with the kingdom of God.
I would say the vast majority violate this,at one time,or another.
Or, refusing to talk to Mr. "Snooty" at a party because you don't like his attitude
etc
Heb 12:14 Follow peace with all men, and holiness, without which no man shall see the Lord.
Rom 12:20 Therefore if thine enemy hunger, feed him; if he thirst, give him drink: for in so doing thou shalt heap coals of fire on his head.
Isa 65:5 Which say, Stand by thyself, come not near to me; for I am holier than thou. These are a smoke in my nose, a fire that burneth all the day.
A lot of people violate this also,but probably not the vast majority,and if so some of the time it will be mild.
It is doubtful that after a person is saved,they will live sinless for the rest of their life,without a pause every now and then to let the flesh have its way,but some people will not let it become a habit,and it will be in tiny things,like the 3 topics you mentioned,for not everybody ignores the Spirit in big things,and some people might not be aware sometimes what the Spirit wants,and some might purchase an inexpensive item,and might talk about someone but not in too bad of context.
But the 3 topics that you mentioned seem to be the 3 topics that most people will violate,at least one or the other,but I believe all 3.
I think pride would be a big one that might crop up on some Christians,for that is a temptation that would rear its ugly head a lot,why,because the world is based on selfishness,arrogance,and self exaltation,which not everybody feels comfortable doing on the same level,as in a big way,but it is still there.
Look how a lot of Christians go at it,retaliating against each other.
Look at youtube,where vegans are against people that eat meat,but the vegans are against the vegans,making videos not only about dogging out the meat eaters,but the vegans too,and the weightlifters are dogging out the other weightlifters,and whatever subject group,is dogging each other out,and dogging other people out,in the videos they make,and the Christians dogging other Christians,and other people,in their videos,all the while the people that post comments to those videos,are having a field day with each other,dogging each other out,calling each other names,for that is the nature of people to be above other people.