There are several.

1) Don't bother working your spells when your faction isn't in power. It's a waste of time, a waste of money, and a waste of patience.

2) When working personal enchanctments, see if you can't find a Shal'ille with purge to help you with this. If you want to go the extra yard, supply the purge regs! If this can't be managed, simply hang out in a high traffic area.

3) Touch spells are a cinch. Just cast them and pound away.

4) For all combat spells, find tough monsters. The stronger the monster, the more likely the spell will imp. Incredible results have been reported from chieftans and mollusks.