Break out your charts, make up a cross country, and dirt-fly (finger-fly, or chair-fly whatever your term is) with someone else (you pilot, him ATC) or play both parts yourself. Anticipate where you will be switched from clearance, to ground, to tower, departure, center, atis, approach, tower, and ground.

Also, (and Tony correct me if I am wrong, but I had good luck with this) especially in busy airspace, don't be afraid to say "unfamilliar" or something similar. I found admitting I was a rookie, gave the controller a heads up to talk a bit slower and anticipate I might botch something up something like using the prefix "Student Pilot".

And don't be afraid to ask for progressive taxi. It may p*ss off ground. But an incursion will p*ss off a whole lot more people.... or worse.

I guess I live by the thought: it is better to look stupid, than prove you ARE stupid.