"A good rule of thumb with any pruning is like in cutting lumber, measure twice, cut once. Try to visualize what the tree or shrub will look like when the branch(es) is removed, and certainly have a mental image of what you want the finished product to look like after you are done pruning, otherwise you'll go too far. The hibiscus would probably benefit from a dormancy period. Allow the plant to dry and drop leaves, keeping it barely moist for about 6 - 8 weeks. Then move it to a warm, bright location with some direct sunlight daily, and begin watering heavier, allowing only the top one-half inch of soil to dry. Fertilize only during active periods of growth."