I'm looking for the challenges that everyone has overcome with learning to ride, especially with commute...

A little background - I started riding in college, first for tri's and general riding, then commuting, and now I'm about 90% on my bike (accept when I'm hauling my bike to go ride it elsewhere - go figure ).

I know logistics are always problems, learning how to deal with cars, to shower or not to shower, etc.

What are unique challenges that you've faced? And more importantly, how did you overcome them??

Thanks in advance!