I also recommend going to Erik Moen. Since he's a PT, he will understand what's going on and will make changes when he can and recommend other changes if they require parts.
I'd also say to do it as soon as possible. Not only could you be damaging something but if you're going to ride STP, you want to be comfortable with the new adjustments by that point. There will be changes and he recommends doing short rides for the first week to get used to them.