Yeah, the only parts you really have to look out for is when you kill Griever (second form/battle), because he casts Shockwave Pulsar himself before going down. And when facing the fourth form/battle, make sure you take out Ultimecia's lower half as soon as you can target it, or her upper half will draw magic from it, then cast it. I think it's Armageddon...but whatever it is, it ain't good. Then just wait till she talks. It doesn't matter how much damage you do in between her phrases, and after she says "And...", hit her again. Voila.
Oh, and look out for that one spell that reduces everyone's HP to one during her fourth form. But there's plenty of recovery time afterwards, so it shouldn't be a problem.