We have a big apple tree in our back garden that has been left to go a bit out of control. The whole canopy needs reducing and a few of the lower branches need to r chopped off. Is this a job for a proper tree surgeon? It would defo need a chain saw to get through some of the branches but how much can I expect to pay? Total newbie to gardening here...so fudging as we go along. Also, is this the best time to do this sort of work?