I agree with others that to properly learn ascending technique you may want to practice on full-sized gear and then downsize from there. This is a good resource for anyone looking to set up a system:
http://technology.darkfrontier.us/Vertical/Frog/
Another consideration is that in most canyons you will only be using your ascending rig in the case of an emergency. (Even a stuck rope is a low-level emergency) When emergencies arise is not the time to be learning your gear. I would suggest having a system that you have trained on extensively, so you can efficiently put it into action when needed. I would also suggest either wearing the up gear at all times or having gear that can be quickly attached and used. Think thunderstorm approaching or your buddy is in trouble = no time to be fumbling with unfamiliar gear.