Thanks to everyone for their advice. I was able to set up the trainer easily, and have already spent some time on it riding, and practicing shifting and clipping in/out. I also have a problem with wanting to be seated when I take that first pedal stroke. I think the pedals are giving me the confidence to get over that - I think that my feet came off the platform pedals so often that I didn't trust them enough to put all of my weight on them when I started.

Practice continues