Pruning apple trees

I'd start with getting weights onto the branches that are pointing straight up. Once you have them weighed down so that you can more easily pick the apples, you will be able to make out which ones are overlapping and need to be pruned

I've just bought a Golden delicious and a Victoria plum at a supermarket, and all their branches are pointing upwards, so I'll get them planted up and fill up my water bottles to hang off them.