See under Q&A “Mango Fruit Loss” for how to deal with an older, overgrown mango tree.
UPDATE: added more videos below.
YouTube videos by Dr. Richard Campbell, past tropical fruit curator at Fairchild Gardens
▸Pruning young mango trees:
▸Pruning too-vigorous mango trees (too many leaves and not much fruit):
YouTube video by Chris Wenzel at Truly Tropical farm in Delray Beach, FL.
▸Pruning a young tree: