We decided to take down some of our trees a few years ago, they weren't dead but were 55' high and basically stopped sunshine from mid afternoon onwards - Leylandii gone wild. They were tall enough to fall either on the house, the electricity supply cable or the lane outside, in fact they were bordering the lane. I asked around and for some reason nobody wanted the job so I ended up watching Youtube videos of trees falling on houses, cars, etc and set to.....
I didn't fancy climbing up and cutting off branches like the pro videos did so I bought a lot of rope, slung it round the tree about half way and tensioned it with a couple of pulley blocks in the direction I wanted them to fall. By the third or fourth tree we'd got it down to a fine art !
Brian