How do you prune a hibiscus or azalea bush? What angle do you cut at to trim bushes and trees?

I don't know about azalea bushes. But, with hibiscus, you generally cut the branches back to how tall you want the bush to be, plus a little extra for foliage growth during the growing season. Just cut the branches at a 90-degree angle using a pruner or loppers. This will stimulate side growth of leaves and flowers from the remaining branches. The next season, you cut the branches that sprouted to the same height as the original branches. This results in a very bushy hibiscus that will only grow to the specified height.