There is a woman named Arvena Thelas in the town of Anvil who has four rats in her basement (the same as the first Fighter's Guild quest). If your level is high enough that rats do not cause you significant damage, you can break into her house, annoy the rats by punching them (or casting drain fatigue spells if your punch is too strong), then letting all four rats attack you while you just cast an occasional heal spell. This is also useful for raising your Block skill, and is much easier than repeatedly causing summoned monsters to attack you.
Gain access to the Arcane University. Go to where you make spells and make a spell that damages armor and put it on "self." Use the "Duplicate items" glitch on repair hammers then just cast and repair to get the skill up.
Finish the final Umbacano mission using the option of giving him the fake crown. After the mission is complete, take the crown off his corpse. The crown is broken and does not have a health percentage. Buy many hammers and keep repairing it. Because it has no health you can repair it an unlimited amount of times, raising your Armorer skill quickly.