man, cut trees are easy as hell to see from a helo. especially more than one, thats a pattern, and where there's a pattern there's a person behind it. i would say to only cut branches if you can. and an extra step would be to paint the cut marks over with paint matching that of the tree. oh and cutting a tree down, with a saw or axe is gonna make noise. alotta noise. and if there are houses near, you might wanna reconsider. but if their small bitch trees then no problemo.