Cut out all dead woody canes cutting clear down to the base of the rose bush.
Next cut out any canes that are crossing each other. Cut clear down to the base of the rose bush.
Cut out any center growth to keep the center open. This promotes outward growth that will make for a fuller rose bush.
Remove any growth smaller than a pencil.
Prune the final three to six healthy canes that are left by cutting off the top third of each cane.