As already noted, you don't have to prune at all, and especially you don't have to prune down to a stump. I prune, but only did to a stump the first year. Now I just prune to remove the smallest branches - the larger plants could still be 2-3 feet tall when I'm done.
The one thing to keep an eye out for when bringing plants inside is the development of aphids. It's good to see if you can find a source of ladybugs before aphids hit. If you can't find one, get insecticidal soap or neem oil and start using it the minute you see an aphid. Then keep using it - they have a very rapid life cycle and reproduce very quickly. Their eggs are rather impervious to insecticides, so you'll want to keep at it until even the new hatchlings are done in.