I always use the fence, and I actually reinforce the 'built-in' fence clamp mechanism with separate clamps, but I still have failure. The fence on my table is totally ass-tastic.
I saw a cool jig for taper-cutting with a fence, though. You can buy it at Lee Valley, but it'd be simple to construct one, too. Might be worth the investment, as I have no fewer than 5 guitars 'planned' for the future. If I make the jig, I will also make it so that it uses the er... mitre groove... er... or whatever it's called... instead of the built-in fence. It'd make for a smoother cut if the wood's not frictioning up against my crap fence.
Saw some sort of low-friction tape in the catalog, too. I wonder if that would help my fence to perform better?
Regarding the plane-- no, I haven't used a hand plane yet. I've never quite understood the theory behind a hand plane, so I haven't gotten around to trying one out yet, either.
Greg