Don't let them pressure you. Do it in your own time!
Sky's old owner was surprised and thought I was being a silly girl for not riding Sky the first month (first day really) that he arrived at the new barn.
I stuck to my guns and worked with him on the ground and guess-freaking-what. When I got on, I never fell off again. He was calm and happy, and we ACTUALLY got some progress.
So there you go, an example of what listening to your gut feeling ends up like.
Pressure should never get to you. Always follow your gut feeling!
My favourite thing to say to someone when they won't back off (I'm talking they won't accept your no thank you or keep bringing it up): My horse, my decision.
"Strength is the ability to use a muscle without tension"