Sterilize the blades of your pruning shears by rubbing them with hand sanitizer using a clean rag. This will help prevent the spread of plant diseases to your hibiscus as you prune them.
Cut the branches back in early spring. You can trim approximately one-third of the branches off as long as you leave two to three nodes or bumps on each branch. Make the cut above a leaf node that is facing up or out from the branches using pruning shears. Clip long branches that are disproportionate to the rest of the bush first and continue to prune the remainder of the bush in the same manner.
Prune any dead branches back to the base of the hibiscus in late fall using pruning shears. This will provide the new shoots in the spring with an opportunity to grow without the weight of dead branches in the way.