Ok, heres the trick:
1. Make sure you can solo Ahn'Quiraj (Around lv 110) Or get a Friend/Donor to help you.
2. Have someone to port you to Ahn'Quiraj
3. You will find 2 entrances, go to the one on the left
4. Now that you are in, head to the first boss (If you don't know where it is, search WoWhead :3)
5. Kill him
6. Loot the books it dropped
7. Use those books
8. ??????
9. Profit
NOTE: The bosses are "Duped". There are 2 of the same boss, on the same place. Be careful to not aggro both, but make sure you kill both, so you get more books.
Also, you can't use Rogue or Warrior skills, because they require Energy/rage (Unless you are a druid)
And you can't use mage books, because somehow, those are not bugged.
If you are not a caster (You have no mana bar) Spells will cost no mana!
You can get those books from other places, but Ahn'Qiraj is the easiest.
Happy Exploiting6):
P.S. Try not drawing unwanted attention. Don't cas't spells that don't belong to your class on ramdom people on the Mall, you might get in trouble.
Click here to know the books you can get