I hear alot of talk about proper pruning but in all honesty....how much pruning is done to satisfy the customer's want more so than the health of the tree or safety of customer. Anything more than pruning a deadlimb is unnecessary or improper but yet we all make money doing it. Almost every time the customer tells me to trim it like it is mine and I walk away and don't do anything, they get upset.....even though I did not charge them anything.
You need to read Ed Gilman's book.