“BTW, you might get lucky and the drum will pull off without having to do anything. If it won’t pull off, take a wooden or rubber mallet and hit the drum a few times from the side, then if you’ve been living a good life, it might break free.”
And if you’re not lucky, once you’ve backed off the adjuster, hit it the drum with a mallet and the drum still won’t come off, they make a tool called a “drum remover” or “hub remover” that will do the trick without damaging the drum.