Take apart only one side at a time, this way you will have a "good" side to compare to when you reassemble. With the price of new wheel cylinders,I would not go to the bother of of trying a rebuild kit (some of you guys remember cylinder kits, right?
). A flare nut wrench is a handy item when you try to bust the brake line loose. Sometimes a standard open end will work, but not often. While not recommended, small vise grips will work in a pinch. Acceptable flare nut wrench sets can be had cheap at places like Harbor Freight (keyword here is "acceptable"). Watch out for placement of the shoes, you have a primary and a secondary shoe, one goes in front, other toward the rear. You will have to bleed, at a minimum, the side you worked on. As mentioned before, pay very close attention to how it comes apart and assemble in exact reverse order. Brakes usually are not tough to work on, but with there intended design purpose, doing it right is most important.