Satan is a limited, fallen angel. He has no power but to tempt us.
"For this reason, when I could endure it no longer, I also sent to find out about your faith, for fear that the tempter might have tempted you, and our labor would be in vain." 1 Thess. 3:5
Satan is not omnipotent, omniscient or omnipresent. He can only be in one place at a time, and only do one thing, although he can send his minions, the demons to do his work of tempting. Satan, can, however, see things from the outside. Thus, if you are drinking, partying, etc, he sees disobedience and he will work with it to tempt you more.
"And you were dead in your trespasses and sins, [SUP]2 [/SUP]in which you formerly walked according to the course of this world, according to the prince of the power of the air, of the spirit that is now working in the sons of disobedience." Eph. 2:1-2
Only God knows our hearts and minds.
“I, the Lord, search the heart,
I test the mind,
Even to give to each man according to his ways,
According to the results of his deeds." Jerm. 17:10
"for whenever our heart condemns us, God is greater than our heart, and he knows everything." 1 John 3:20
By the way, that heading "Peter to lead the church when Jesus gone " is just something added recently. Nor does Luke 22 predict the future. I was just listening to a sermon today that Peter always spoke first - something like 20 times when Jesus asked questions. I think any being (human or demonic!) could figure that Peter might be important from the way he acted.
Besides, Peter was not the leader of the church. Paul became the leader because of his evangelistic efforts. Peter just gave the speech at Pentecost and led in Jerusalem until the church was dispersed. Paul was much more influential and became the de facto leader, because of his missionary travels. Peter really drops out of the Bible after the conference in Jerusalem about whether Gentiles needed to be circumcised (Acts 15:2). He lost his leadership by siding with the Judiazers and other than Paul mentioning him a few times, and 1 Peter (2 Peter apparently is very different in style, and has more in common with Jude than 1 Peter), Peter stopped being a force very early in church history.