Nice short video by Tim Ard on felling. Only 8 minutes: https://www.youtube.com/watch?v=Wj1d85CLDOQ   Video is clear and short. I liked how the plunge cut was used on a small tree. The plunge cut allows you to get the back-cut done, your hinge nicely created, then you can insert a wedge, and finally you just cut the bit of wood at the back of the tree and it falls, perhaps with a few wacks at the wedge you installed. – Bill Kleiman