Shown above (the one on the left) is a tree that was leaning over the house last spring. It was damaged in an ice storm, developing a crack in the main trunk, so I wanted to pull it down in a controlled way rather than risk having it break apart in a storm and fall on the house. So I asked someone to help me get it onto the ground.
Once it was down, it was as shown below.
It wasn't terribly large in diameter, but was pretty long and was blocking the area where I normally park, so it had to be cut up. Below is a view from the other end.
It could be cut up with a manual saw, like a bow saw that can be bought at any hardware store. However, it would take a lot of time and probably be pretty fatiguing to cut up that much oak by hand. I used a chainsaw. Since I don't use the saw very often, I have a battery-powered one (so I don't have to mess with 2-stroke engines, fuel stabilization, etc.). Battery-powered saws are also a lot quieter. Nice ones are made by Stihl, Husqvarna, Oregon, and others.
First I cut off most of the smaller limbs then began making cuts to the trunk, using cubits as a rough guide to length (my stove will take 20" logs). Eventually I had just a long section of trunk and used a timber jack to lever it up off the ground for remaining cuts (I got mine at Northern Tool).
Timber jacks are easy to use. Just set the hook, pull the lever toward the ground, and the trunk--even a very heavy one like this water oak--pivots up. It starts to get harder to do as the remaining amount of trunk is reduced; eventually, some other support will be needed to do the last cut (like a saw horse or two concrete blocks).
The finished result (with some unrelated pine logs in front) is shown below. It took less than an hour to cut the tree up (and as can be seen, the interior of the trunk was rotting).
From this point, to make firewood, the larger logs need to be split--using a gas-powered splitter, wedge and maul, axe, or other method.