My wife got me a set of Kreitler rollers for my birthday.

I haven't set them up yet, but I have the components out of the box and it looks pretty easy to assemble (I figure I don't need them until winter, when the weather gets bad).

Anyone with tips for how to get started with them?
The instructions say to set them up in a doorway, so you have the doorframe to hold onto when you start and stop.