Harness problem

I'm having a problem getting my kitten to adapt to a harness. She's
almost 6 months old and I want to be able to have her id on her in the
form of a tag. Unfortunately, her first experience was with a collar
and it somehow got stuck in her mouth so that it wouldn't snap free. I
had to cut that one off of her with a pair of scissors.
Now I want to try a harness because it's not in the same position as a
collar, but she spazzes out whenever I try to put it on her. She is an
indoor only cat and I did get the microchip put on her; should I just
let it go at that? If not, can I get some advise on getting her adapted
to the harness?

many thanks