That's pretty much it, but be careful, cause there's a mistake a lot of people make and it is often the difference between poorly executed sweeping and very good sweeping. You cannot let the notes ring into each other, so don't hold down a barre chord and sweep, that's not the purpose of sweeping. It may sound good, but once you add any distortion it sounds horrible when the notes ring into each other. This usually isn't a problem, but when you are playing notes on consecutive strings on the same fret it gets to be tough, you have to learn how to roll your finger such that you mute the note with your left hand after you play it. It's mastering this technique that separates the men from the boys when it comes to sweeping. (I sadly, am still a boy.) To really get it down, it takes awhile, and it aint easy to do it at high speeds. For in depth lessons, go to www.guitarworld.com and go to the lessons sections. Yngwie and Petrucci both address this issue and give relatively good sweeping lessons. While I dont really like their style of music, they do know how to explain things when it comes to technique, i suggest you check out the site. They have lessons from tons of people verybody from Buddy Guy to Dimebag Darrel to Eric Johnson.