Repeat until adept (estimated 90 repeats) :
The skill must be practiced against a non-pacifist mobile. I suggest using the mouse in the playground but any will do.
- Give coins to the mobile (eg give 10k coins mouse)
Steal the coins back (eg steal coins mouse)
Stealing coins has a slight advantage to stealing items. You can give the mob 10k coins and not have to reload it for a while, where if you steal items you must restock the item you stole frequently (I suggest magic mushrooms, rabbit meat, balls of light or other easy to replace preferably free item). The XP and % gains seem to be the same.
Also note that failing to steal coins from a mobile doesn't seem to cause it to attack you, another reason not to use items.
Should be enough XP for a thief to go from L2 to L3.
Details
Steal attempt message: none
Steal success message: items: You stole * from *. (IE: You stole dried rabbit meat from a mouse.)
Steal success message: coins: Aha! You got * gold coins. (IE: Aha! You got 879 gold coins.)
Steal fail message : items : Oops...
* yells '* is a bloody thief!' (Lady Kherrian yells 'Kezek is a bloody thief!')
( may not appear if the mob is already engaged in combat )
Steal fail message : coins : none - use gold prompt token if necessary
Steal fail message : level too far above: You really don't want to try that!
Steal fail message : fighting : No way! You are still fighting!
XP on success : 160 xp @ level 3
Adept message : You are now an adept of steal! You gain 1000 bonus experience!