I got the invitation to the thieves guild saying I need to steal a shirt from a residence to prove my worth. I don't know if i got a bad mission or what but nothing is going right. I get to the town and enter every house except for 3 locked ones. I go in all the open houses - none of them show up on my map with the name of the resident they gave me. One house does show up as "Residence". I use Open spell to get into that house as its locked and open a wardrobe stealing a blouse which i assume is not the same as a shirt. There is a ladder leading upstairs but I already used my mana on the Open spell and the game appears bugged as I can't climb the ladder. Another issue I stole something from another house in town before this house and as soon as I pluck the item guards show up which I took out. How do I steal an item without guards showing up do I have to sneak or invisibility?