i looked at a hedge of arbs.... there are 17 arbs about 15' tall and up alittle. they want to trim them down to about 10, maybe 12'. not looking for a price, just wondering what would your method and timeing would be to do this. at the recommended height, the trunks are too thick to use my echo trimmer, maybe 2 1/2". would you use a chainsaw, or a hand pruner/saw? would you wait until the season gets alittle colder, for the safety of the plants? and would you let them heal on their own, or use that paste?