Here is an example of what you have to do to make sure you don't have any close calls when felling a tree.
When the weather cleared up recently enough for me to finally tackle this tree, I decided not to get too cute with it (like I originally had drawn up) and only used one anchor point with a pulley (and strap) attached to one tree to make about a 75 degree angle on the pulling direction (I attached a few pictures showing my rigging).
Thankfully things went very well.
For this tree, I had a decent amount of pulling force on the tree (but not too much) before I made my notch cut. While I was making the notch I was paying close attention and made sure I did not make the notch too deep. After making the notch I went back over to the rope puller and cranked it pretty good to straighten up the tree even more (btw this tree had about 12' of back lean towards the cottage so I really had the adrenaline going).
It still was leaning back quite a bit while I made my plunge cut. I left about 3" of hinge wood first, then cut back towards the back of the tree leaving about 2 inches of hold wood there. I got 2 wedges in there and pounded them in as tight as they would go. I then finished the hinge leaving about a good 2" there.
I went back of to the rope puller and gave several more good cranks. The tree looked to be finally starting to get vertical. I pounded the wedges in again as tight as they would go and then made my final back cut.
I finally heard some cracking and the tree started moving. It was going over perfectly in the direction I had intended, but then just started to slow down as the top was rubbing past the top of the tree next to it. I was expecting this so I was on my way over to the puller again to crank some more to keep it going, but it had enough momentum to get past this and finished going down on it's own.
My wife had some nice video of it and was really cool to watch it (she was out of breath she was so scared
). I was pretty pumped myself and felt really good to get this one down safely.
I mention all of this because the pros usually are getting what they deserve when it comes to dropping "hazard" trees. I had about 10 taken down professionally because they were too dangerous for me to handle as a newbie.
Good luck.