Requirements:
*Rosethorn Hall (Skingrad house)
*Eyja as your servant

If you don't have Rosethorn Hall, you can purchase it from Shum Gro-Yarug. Your best bet is to find him in the Skingrad Castle. The cost is 25,000 gold, the most expensive house in Cyrodyll. Once you have it you will have to purchase the Servants Quarters from Gunder, the owner of Colovian Traders. Next, find Eyja, she will most likely be found in Colovian Traders, and get her to become your servant for Rosethorn Hall. Once she is there, go into sneak mode and consistently pickpocket her (A then B.) Just keep doing that and in a while you will have your sneak skill mastered. Eyja won't care if you pickpocket her so this makes it very easy so if you get caught you won't get a bounty.
Hope this helped!