Answer:
If it is a really large tree over 25 feet tall, it is wiser to call a tree service company. Look again at where you'd want the tree to fall. Now see what happens if you miss and it goes ten or twenty feet to the right, or to the left, or backwards. If there will be costly damage, then call a tree service company. If you still want to do this yourself, you will need a chain saw, goggles, and hearing protection. There are instructional videos on YouTube.