Pruning plum and pear trees

Morning

I've just about finished decimating my apple tree (which was totally overgrown), and I need to start turning my thoughts towards my plum and pear tree.

The plum (Quetsch) is fairly young, but is not on a rootstock.  At the moment it is in a fairly open shape, but it is far too tall to actually harvest from.  Could i reduce the height of all the main branches by say... 2/3s which would give it a more spherical shape rather than the cypress fir shape it is currently?

The pear (which may be conference, I don't know I've only ever had 2 pears off it) is in a very awkward location againsy my boundry, and has to compete with the beech hedge and the (not so huge now) apple tree.  Again it is a fairly young tree, and from what I can see also not on a rootstock.  Like the plum it is growing in a very tall manner, and up until the apple tree pruning the branches were intertwined with the apple.  How should I prune this to encourage better fruiting?

I could probably provide photos if i can get home early enough if that would help.

Thanks

Oh, I inherited the trees when I bought the house, I didn't plant them

Not at all, I'm interesting in replies to your question too

I was always taught that stone fruits should not be pruned until summer, not spring.

According to the RHS it's spring for young trees and mid-summer for established trees.

It is recomended in most gardening books that you leave pruning your plum tree until July. Pruning it in the Winter will increase the risk of silver leaf disease which would kill the tree.
Lee