That's the plan- when they had me try out the rollers at the convention, they gave me the exact same instructions. I expected to fall, but once they got me started and talked me through the stiff form and got me to relax, all of a sudden, they told me they weren't holding on to the bike anymore, and I looked down at their hands and was like "wow!". When I got off the rollers, I bought them.
I have a hard time sitting up on my bike when riding the streets. I just never trusted I had the good form to try it, and the one time I did, I hit a car. Total embarrassment. Luckily, the car was parked. I'm sure by the end of this winter, I'll be able to sit up and do just about anything on that bike. I've got rollers to work with now, so I think this winter, it'll be an interesting training season for me.
Koffee