And whatever you do, DON'T take any more than about 20% of the live foliage out in one year. The rule of thumb for pruning is remove dead/diseased/damaged/crossing and competeing first. It you are snder 20% THEN toy can prune for ethsetics or space. This is a guideline. Like canyobc stated, hire an arborist. They know how to make target cuts, limb length reductions..........oh and most of all, they don't screw around with ladders, much!