To anyone trying this, do not give up. I levelled this lock to 90 a couple of weeks ago so if I can do it, you can too.
This is the guide I used and in my opinion is the best out there http://m.youtube.com/watch?v=t9CORoqJE0g
I was trying all day yesterday, got very frustrated and decided to give it a rest, after studying this guide some more I got him in 2 attempts today.
Do not forget to use purification potions, they will help you a lot at lower gear levels.
Anyone attempting kan, I hope this guide is useful to you and I wish you the best of luck.