Ok, i just got Softimage|XSI Professional on my computer and i feel retarded.

I am unbelievably good at SketchUp and now im trying to move into something far more superior and I don't know where to start.
Is it possible to become
decent at SoftImage without having to take college courses?
Anybody know of any sites for good tutorials?
Anything else I should know?
Thanks in advance
Alexsabree