Well, not having many tools, I imagine if it was off a tooth or two I'd have to take out the cam and reset it like that. It's not actually hard, but I'm at college, working in a public parking lot, not exactly my cup of tea.
Unfortunately, its not as easy as undoing a clamp bolt on the dizzy and turning it to get the timing right. You can only do timing though the belt as far as I know, unless you get adjustable cam gears.