Inaccurate Spell Levels

[Dymerius]

This is actually an issue that I was fooling with a while back, but never had any success. I'm about to start messing with it again, but I figured this might be a good place to start troubleshooting

I'd like to adjust a lot of the levels that classes can use certain spells. (Right now, the spell levels are scattered around instead of being at their usual 5-ish level intervals)

Is it as easy as modifying the levelx fields in the spells table? I had some problems with changes made in the table not being reflected in game, so I just wanted to check.

What all is involved in changing when certain classes can scribe a spell?

Thanks in advance.