I finished building my fixie yesterday and took it out for it's first ride today. I rode for about an hour on the KATY trail. It was a different experience. I was surprised at how many things I unconsciously do that can't be done on a fixed gear. A series of ruts perpendicular to the trail that I'd normally stand and coast over require a bit more confidence to pedal across.
Ultimately, of course, I came upon a blind road crossing with a squeeze gate and discovered a needed skill that I haven't acquired yet. Scuffed up my brand new Cinelli handlebar tape. Oh well!