Don't worry about the timing locations... Being that those gears are slant cut, you'll have to move the cam a bit when you put the new gears in to get 'em lined up right. That won't be a problem.

As for getting them off... you'll need the appropriate puller(s). The crank gear should have two holes that are tapped to accept bolts. I forget what size... perhaps 5/16-18. You can make a puller for that one, or maybe use something like a steering wheel puller.

You'll also need a puller for the cam gear hub, and that can indeed be a difficult one, as once the fiber part of the gear is gone, there ain't much to grab to. Perhaps you could grind notches in it so you can grab it with a normal pulley puller...? Sounds like you've got 3 weeks... you'll figure it out by then. Try to avoid damage, and try to keep things clean in there...

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-Matt I ♥ my ♂