First u have to get the sandman perk and be at least level 10. to get the sandman perk you have to have at least 60 to your sneak skill. there are some kids in the game who can't be killed. so go to andale go into one of the main houses at about 1 o'clock and sneak into one of the houses. use the murdering perk that comes with the sandman perk on one of the kids as many times as u want . u get 50 EXP. everytime u use it. it is helpful earily in the game but can help anyone .