hkk said:
Should I finish getting all my Squire abilities before heading onto Knight?
Definitely not. Do get JP UP and Move +1, though - they're some of the better Move and Support abilities at the start of the game. And like a previous poster said, leave Ramza as a Squire for a while; he's much more effective once you get his specials (which are all technically Squire abilities), like Yell, Cheer Up, and eventually Scream.
I'd also keep one guy as a Chemist until he gets Throw Potion. Then you can equip that and Item to have all the usefulness of a Chemist as another, more powerful class.
And if you just want to cheese XP and JP, get a Knight with Speed Break and equip everyone with Squire active abilities on their second slot. Speed Break the last mob down to 1 speed and have everyone Accumulate ad nauseum, since you can do it all the way to IIRC 255 ATK power, it doesn't do any damage, and gives full XP and JP since it targets yourself (always 10XP for hitting an even-lvl target).
Good luck with FFT. Great game; I've beaten it something like 6 times.
And if you *really* want challenge, check out the first Tactics Ogre game (JP on Super Famicom, English on PSone). It's awesome, but very very hard. Personally, I like it head and shoulders above FFT for the challenge, story, and characters. Course, it was made by largely the same team.