I can't explain how to keep it under control. However, I will say that if you have more money than sense, soon you won't have. Deal with that now, or you'll wind up like me, with an angry bank manager and more basses than I know what to do with.
Disposal decisions: Anything you're not playing can go. Anything you're sure you won't need in the next six months can be got rid of, unless it's impossible to find another or it's actually appreciating.