Pear tree pruning

:dh: I have grown a pear tree in my garden. Last year I cut it back as I was strugling to reach some of the branches. I didn't get as good a crop this year. When should I prune and by how much? :gnthb:

 

I have grown a pear tree in my garden. Last year I cut it back as I was strugling to reach some of the branches. I didn't get as good a crop this year. When should I prune and by how much?