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Hi I didn't read all of the other posts but I wanted to show you the harness I had for Hope. I loved it. It is very lightweight and not bulky. I got it from Atwoods ( that is a farming store) but I'm sure you could find it somewhere else. It even has a little flower on the leash part.
She was 6 years and never walked on a leash before when I got her. She did very well on this. there are no straps to adjust she just steps right in and there is a clasp on top that you pintch and push it down till it fits her. I really liked this harness! All the others seem so bulky and could be hard for a little one to walk in. It didn't cost much.
I would put her harness on her and just let her walk around the house in it without you holding on to it. just really praise her when she walks and get her on her level and have her come toyou. just let her get use to walking in it around the house in it (ofcourse when you are right there so no potty happens

maybe right after she has gone potty) lots of praise and ive treats while you are putting the arness on.
Good luck and don't give up!! I wish I could get another Yorkie but I am not going to until I Retire (30 years

) or can stay home full time because I have learned from this site that Yorkies don't want to be alone. And my work schedule and drive time has me away way to long to have a happy yorkie. So all I can do is come on Yorkie talk and see everyone elses babies and cry because I miss Hope so much ( She passed away a few months ago) They are they best dogs so don't give up it will just take time. I understand all of your fears because they were mine too.