I plan to get to 60 theive or so using the black jacking method. But first I have to get 45 theive. I am currently 44 and dont know what to do. I have tried Sorceress' Garden and have found the spring one to be almost impossible (im bad at this type of thing). And I dont want to go through the winter one 90 times. What else could I do to get 45?

I like pickpocketing Master Farmers. Decent xp and you can sometimes get good seeds, like ranarr.