You can also start working on IAD combos instead of learning all the specifics in that guide. They seem hard at first but they're not that bad once you get started. Start with something easy like S, 2HS, sjc.IAD p, HS, land. Then try something a little more difficult by replacing the p in the last combo with S. Still not that hard. Then try this combo. It's not hard to do, it'll just get you ready for the hard combo because it's kind of similar. S, 2HS, sjc.IAD S, HS (hits twice usually), PIN, land, S, 2HS, sjc. S, P, P, HS. Now work on that for a little while and get comfortable with it. Now do the same combo but don't use the pin.
The reason for doing this is because once you get this one down, you'll use the first relaunch combo against the girls and Bridget; and the IAD combos on the guys.
Once you get all that down then you can start with the ones that IAD across the screen three times...but I don't want to overload you.lol
EDIT: I'm STILL having problems with IAD combos on Johnny though. Since Slash is coming out soon, I don't think I'll bother practicing with Millia on #R anymore outside of matches.