Your fears are natural, this is my first yorkie also but if you read all my posts since I joined this Feb you won't find one negative thing.l

Actually that is a lie, On many occassions Ive mentioned she is too perfect and no challenge to me lol. Potty training 2 wks, only chewed one bit of wallpaper,doesn't bark hardly, loves people and other dogs , never had to get her up in the night for wees and is completly trained and she has just turned a year old!
Im not on here to boast but to assure you that all yorkies are different and to say regardless of the above your baby will be your best friend and will love you unconditionally.
Don't give up. x