[FTC]: What should I know about CAD (via Pro/E) for FTC?

[Techhexium]

After I have recently taken a keen interest to getting my feet wet in CAD with Pro/E (that's the CAD software given to all teams in FTC), I am wondering what should I know about CAD that will be useful when designing a robot through CAD during the season. So far I have mainly been practicing on assembly modeling. What other concepts of Pro/E should I also be familiar of?

Currently I am learning how to use Pro/E through PTC tutorials rather than just experimenting as I find the interface to be a learning curve compared to the ease of use of Google SketchUp, which I used in the past though not anymore.

Thanks!