I need help with pick pocketing notes for Rogue Epic

[DinoTriz]

So I'm trying to pick pocket the notes in the first part of the Rogue Epic Quest.

I'm level 51 and I have a DE illusion mask, so I attempted to pick pocket Tani N'Mar in Neriak first, since I'm close by.

Well, my first attempt ended in a death. Everyone made it seem so easy, but maybe I wasn't prepared.

So what I did was I got behind Tani N'Mar (with my DE illusion on) and I both Hide and Sneaked. Then pick pocketed. I failed about 4 times, going back into Hide & Sneak each time. Then I critically failed and somehow got out of the Rogue guild before dying. Turns out running away from backstabbing Rogue guild masters is dangerous.

So, what did I do wrong? I've heard that I should get stat buffed. Should I sneak but not Hide?

Any advice would be awesome. Thanks!