My tip has probably already been mentioned in some form before this, but it's still the one major thing I tell people when showing them SU for the first time: Go through and set up all your own hot keys as soon as possible so you can (a) learn all of the tools and what they do, and (b) create a workflow and keyboard system that you can relate to. If the defaults wrk for ya, great, but at least go through every possible hot key and try it out!