> That would also work. In fact, it is by far the easiest way to go about a one-character game. However, if you have a six-character party, assassins in the back would not help much, and I'd rather have my casters gain SP normally rather than 1 or 2 per level, as they would if they were retrained to a non-spellcasting class. Of course, this is all assuming that the characters in question are in the back three positions (as they should have beenm if they were casters originally). If not, then by all means, retrain to assassin.

The plan I had in mind was something like this:
1) Initially: Knight-Knight-Knight-Wizard-Sorcerer-Rogue
2) As soon as possible: Assassin-Assassin-Assassin-Wizard-Sorcerer-Rogue
3) When the two spellcasters have learned all their spells, swap their classes: Assassin-Assassin-Assassin-Sorcerer-Wizard-Rogue
4) When they have learned all of both sets, Assassin-Assassin-Assassin-Druid-Druid-Rogue, either with the same three assassins as before, or by moving your front three back and your back three forward.

Of course, these changes (especially form 2 of step 4) should not be taken simultaneously (exception being step 3), or you run the risk of losing your whole party.