You first need to get Dog (maybe another companion works).
Go back to Sanctuary and if you haven't found it already, there is a book under the crib titled "You're Special". Pick it up, use it.
Now that it's in your inventory, drop it on the ground.
Tell your dog to pick it up, but right before he does you need to quickly pick it up.
If done correctly he will drop the item and it will be in your inventory still (which also dupes any item btw).
Pick up the copy Dog dropped and you should have two "You're Special" books.
Drop both on the ground and one should now activate again.

To get more than two:
1. Drop special book an clone.
2. Drop both books and pick up.
3. Drop 1 book and clone it.
4. Drop all books then pick up.
5. Repeat step 3 and 4 until desired stats are reached.