I have a partial top denture. I was very reluctant to have it, but the dentist assured me that if he crowned the tooth, the crowns wouldn't last at the front & they would be very costly to keep replacing them. When he put it in, it felt massive and uncomfortable, I really felt I couldn't live the rest of my life with it in my mouth, I thought I was lisping (DH said not), found it hard to eat, terrified of taking it out!
Had it for 4 years now, it is fine, hardly know it's there.
It will take a couple of weeks to get used to them. They shouldn't wobble & shouldn't be painful. My dental receptionist said if they irritated I would need to go back & have them adjusted.
I paid privately for mine & they have been an excellent fit.
When you next see the dentist, maybe ask him to talk through how you get them in out, could you put them in & out a few times in front of him to ensure that you can do it?
If you are not happy after the next appointment I would get a second opinion as a previous poster has suggested.
Good luck!