John Wesley said at aldersgate he experienced a "warning of the heart" when he finally truly believes salvation was by grace and not of works.
I have felt the Holy spirit walk with me often in my life and in many different ways.
As someone said earlier..,a small still voice.
However I have found that we should test all spirits for all small voices are NOT God.
People sometimes accept everything from a spiritual source and are lead astray, they begin to condemn others or themselves for "secret sins" these voice reveal. Instead of understanding the message of grace and love God shows us in His Bible....
others excuse their sins and think God doesn't notice, they beat their wives and steal from their neighbors and yet claim to be children of God.
Their god is not Jesus or the one in the Bible but Satan.
For me the Holy Spirit manifests in my life daily as a song of joy and praise in my heart. As long as I hear it, I know God is with me. And if it becomes silent,i stop and pray a,d find out why.....
Sometimes I walk in a pit before noticing the silence.