I like to go a bit before and after the correction and then slip edit the best takes in while NOT letting anything over lap. You have to zoom way in to do it good. Try to catch it at a note change, strum, beat, etc...
If you need to fade, I will let the clips lap a bit and have the fades come in and out together (overlapping).
To do the fades, Just hover next to the edge of the clip by the upper corner and you should see it pop up giving the option to drag the fade