The Elder Scrolls IV: Oblivion Tips

Increase your armor skills
Here are some tips on how to increase your armor faster
In general, to gain Armorer skill be sure to carry multiple repair hammers every time you go adventuring and repair everything you possibly can.
Repair your own armor and weapons after each fight (even if the health is at 99%).
Repair your fallen enemies' items even if you're not going to carry them with you afterwards.
When fighting a weak enemy, be sure to let them hit you a few times instead of immediately killing them.
Bows are damaged with every shot (even if you don't hit any target): fire your bow into a door or practice target, and repair it after every shot. (If you are firing at inanimate objects, you will not gain any marksman experience).