It's probably not a bad idea either to come up with an increase range, say 3-10 percent. Give your boss a little flexibility. Ask yourself why you're asking for raise. You've got it all sorted out in your head, and preferably on paper, too. Now it's time to schedule the meeting.
Timing is everything.
You have an inkling when the annual review is, but don't wait. Beat them to the punch. Seek out your boss a few months before the annual review. Better yet, approach your boss when you're at the top of your game. A few words of advice about when the big day arrives.