Before starting, step back and envision how you want the bush to look.
Look for the strongest canes with the best flower buds and save them.
Remove all diseased and broken canes.
Remove dead twigs.
Remove weak and twiggy canes with a lot of flower buds.
Remove short and low-hanging canes.
Remove any crossing or rubbing branches.
Remove 1 out of 3 canes all the way at the base, to promote new better-producing canes to grow from the base. Cut out the oldest canes.
Prune out the center of the bush to open it up for sunlight and air flow.