Azaleas should be pruned in a natural fashion, use hand pruners to cut individual branches at the proper spot..  They are not meant to be trimmed with hedge clippers.  You want to keep a natural shape to the plant.  Prune 3-4” off the bush and try not to cut any branch back by more than a third.  You don’t need to cut back to a connecting branch since Azaleas will grow new branches from right below wherever you cut.