I have been doing stumps for 7 years and now going into the tree removal business. I told myself that I would only do removals but have been told if I want to stay busy i need to learn to trim. Questions that I have and I have no idea is does it matter what time of year to trim any type of tree? How thick on average do you leave the limb before cutting off the tips? I know you don't want o use spurs though i do see people use them quite often trimming. I see some people seal the end of a limb when they prune a small tree does this have to be done? I am really clueless about this and appreciate your advice. Thanks in advance.