im gonna try and set up my jem to play .12s tuned to drop C. this is my first floyd rose and i imagine drop C tuning and .12s is gonna be a radical change to my guitar so any advice would be greatly appreciated. should i just take it to a guitar tech?
I would probably take it too a tech since it's your first time. That way you can see how it will respond and what to do to fix it. Although I would say that most drop tunnings at all don't work well with a floyd rose. You would be better off dropping the whole thing down a step or two, just the dropped E will really play hell with the thing probably.