Use the chainsaw to make a top cut at a 50- to 60- degree angle, about 1/4 into the trunk's diameter.
Make the bottom cut at a 30- to 40- degree angle off the horizontal, meeting the top cut to form a 90-degree angle.
Place the saw against the back of the tree, one to two inches above the center of the notch where your first two cuts meet. Make the back cut (felling cut), leaving approximately 1/10 of the diameter of the trunk to act as the hinge.
Insert a wedge into the back cut as soon as possible to prevent the tree from sitting back on itself. Stack wedges to create more lift.
Drive the wedge(s) with a maul until the tree begins to fall.
Move a safe distance away before the tree falls.