I don't think you should have to do any pruning. That is a personal preferance. You know, whether you have space for the plant as big as it is now. This is the second year I have brought my hibiscus in. The first year it dropped its leaves because it did not get enough light and would have made it, but I forgot to water it. Just make sure it gets enough water not to dry out and it will be perky and beautiful again next spring!
Cindy