just a small thing to add (thought itll be covered in the online lessons). It helps to add tap or two with the right hand on the top end. This'll give you an arpeggio over a really big range. On my six you can go through two whole octaves like this (or more).
also remember that you dont just have to do 3 up and 3 down, you can go for example 3 up tap 2 down 1up 3 down. Sorry if thats confusing?
also try doing different chords on the way down as the way up. You can even move position on the neck for this.
try it with different rythms as well, it doesnt just have to be yngwie style ultra fast 1/16ths.
One thing i find it is especially important to consider also is making sure that you keep the sound clean. This is always true when playing, but i find it tougher with this technique (especially on the sixer) as often the strings will vibrate when you dont want from your hand moving, giving an annoying background hum.
when practicing i find it helpful to go through chromatically different shapes, not just chord shapes that are familiar. This way your fingers are stretched as much as possible.
You may find that sometimes you have to play two notes on consecutive strings at the same fret, in which case you might have to roll your fingers. This can be tough to make sure you dont pull off to sound open notes or dont pull off enough.
your thumb will get sore real quick if you're not used to it, so keep an eye on it unless you want to be out of sweeping for a few days.
sorry if some if this seems obvious, but these are just observations i have come accross when practicing sweeps, hope it helps a bit!
edit: that was gonna be a small thing but ah well!
