1. FSS almost entirely. I rarely use scouting trips except if I'm interested in just one player in a big state (NY or PA).
2. I just add 10 pts to each high rating, and subtract 10 pts from each low rating and then evaluate the player on his adjusted ratings.
That's not a perfect system, but on average, normal potential generally improves 10 points more than low, and high improves 10 points more than normal, so that is a quick and dirty adjustment that gets you pretty close.
Since potential was first introduced two years ago, each recruiting period I do a search based on my minimum criteria (by position), dump all the data into a spreadsheet, manually adjust all the reds (-10) and greens (+10), apply a formula I developed, and sort by my personal "overall" rating.
I end up with four lists of players sorted by my overall rating for PG, SG, SF, and Post (I ignore their listed position and go strictly on rating). I then look at the top 20 or so players on each list and pick who I want to go after based on team needs, distance, likelihood to have a battle, etc.