For level 1's, I had a ton of luck with that one lone guy at the eastern Karamja dock as well as pickpocketing HAMs. It nevenr took more than 30 minutes, and got full black in a couple of days. ..did get a level 1 from of thug after whacking them for a few hours. After whacking about 600 Varrock guards I gave up on them for a level 2, but got one after 10 minutes of playing today :/ After that, yep it's cockatrices.