You may have heard of the baseball statue method - personally, I found that a bit tedious. If you thought so too, check out this method!
Make a manual save file before starting, in case anything goes wrong!
If you have a character that you don't want to reset the progress on that's fine, a lower intelligence level simply increases the chance of Idiot Savant activating. All you need is 5 luck, and atleast the 2nd rank of the Idiot Savant Perk.