I took out about a 30" Willow a few years ago. This tree was large enough to see in the google earth sattelite photos of our property. The newer photos show it missing
Since it was up pretty close to the garage and house, and because of he large horizontal limbs(forked about 6-8' up in the air), I could not guarantee which way it would go if cut at the trunk. Because of this I did it in sections. I partially cut the side of eached fork limb away from the buildings, then I attached a heavy piece of double braid nylon line and pre-loaded the section slightly with the truck parked across the yard. This guaranteed that the section was not going to go any closer to the building if it twisted when it came down. Then I cut the side toward the building and let the spring tension in the line pull the section away and gravity pulled down. Because of hte way it forked, I was able to partially conceal myself behind the opposite fork while cutting. Once the big limbs of the forks were down, I attached the line to the fork, and loaded slightly with the line, proceeded to cut flat across the stump and topple the remainig fork portion. I had thought of putting a table top on the stump, but our yard plans changed and I just pulled the stump a few months ago with the backhoe.
Due to the fork and the large heavy horizontal pieces, this was perhaps the trickiest tree I have ever done. I would rather put a large fir on the ground any day. Depending on your experience, it might be better to hire it done. It is definitely not for the faint of heart.
Willow wood is very porus and the tree trunk is basically a sponge. When wet, it is hard to burn and does have a unique odor. When dry, it weighs just a fraction of it's green weight and reminds me a lot of balsa wood.