
The one that needs a support, dont put the steak straight down, do it at an angle, so where it goes into the ground is about 3' away from the bottom of the trunk and it crosses about 3' up the trunk and put a tree tie on there. It means the steak wont break as easily :) :)
How big is the existing tree?????
Take off dead dieseased and dying branches first, then crossing.
Take off the water shoots, and prune down to 2 swelling buds.
It needs doing ASAP as your a bit late and its easy to knock off the buds as the swell!! (but better pruned now then left untol next year :)
Rule of thump :-
Apples are pruned to an Apple Shape
Pears are pruned pear shape.
You should be able to throw a hat through them, or a bird should be able to fly through them :)
HTH
Lea :)