When pruning it's essential to keep your secateurs sharp. Blunt tools can cause branches to tear, leading to wounds on the tree that will attract disease. It's also important to have a pruning saw ...
The exceptions to the 'deciduous tree' rule are maple, horse chestnut ... Conifers require little or no regular pruning except the removal of dead or diseased branches in late summer.
One thing they can be finicky about is pruning. Proper pruning reduces the chances of the tree developing broken and diseased branches, but over-pruning can be detrimental to its overall health.