Blackjacking is the BEST thieving xp in the game, no matter the level. It just requires a huge amount of concentration, if you're on a laggy computer, do plunder. Regardless i suggest plunder from 91+ either way seeing as you're going straight to 99 you'll burn out easily with blackjacking. In sum: Blackjack to 91, get a taste for it then decide if you want to use it to 99 If not, from 91+ use pyramid plunder