Tyler was around 6 months old when he was completely house broken...all though i still have to put a pee mat down at night because sometimes when its cold he pee's through the night! (he is 1 yr old on the 24th!) but he learned fast to go outside it was just accidents up till 6 months when he couldn't hold it and he didn't make it outside in time awwww, I've read in Yorkie books that you shouldn't expect alot from them until their around 6 months especially how little there bladder must be but once they learn they are really good all i did was everytime he went to pee on the floor i said no to stop him and carried him outside everytime and in no time he got what he had to do and from then on he never pees or poops in the house...just a night when its cold he pee's on his mat!
so there is hope! you'll do it don't worry it just takes time! good luck.