Alright well here is a tutorial on how to change something like you armor rating...
Please to flame me this is my first tutorial and this might help out some others that just started, might give them a better idea of how to use...
Well first thing is first, you need to get cheatengine.. I use 5.3, and you can get this at Cheat Engine...
Alright now you log into your WOW character, minimize WOW with ctrl, alt, del, are just hit alt tab... Then you open up cheat engine...
Click the coumpter with with the magnifying glass through it and then scroll down the process list untill you see wow.exe and click it...
Alright now you make sure you have
Scan Type: Exact Value
Vaule Type: 4 Byte
Now goto WOW and take off all armor, now look at at your armor rating thing and see how much you have, lets say you have 100 with no armor...
Now you goto cheat engine and type that into the value bar and click first scan...
Go back to cheat engine and put on 1 piece of armor and scan the new value lets say 200 now type that into the value bar and click next scan this time instead of new scan...
Repeat intill you get 1 value to the left... Double click that value and it should send it to the bottom box, right click the number under value and change it to what ever you want say 999999.... Then you tick the box all the way to the left to freeze it... Now go back to WOW put on all armor and attack a monster, once you killed it your armor value should change to 999999...
Edit: Will add a video if requested...