I’m a therapist and also trained in hypnotherapy. It is possible or but harder IMO. I just tell people to “pretend” instead of “visualize.”
“Pretend you are standing at the top of a staircase” is something most people can do even if they don’t get a visual. It’s “a felt sense.”
You can do this test: if you pretend or imagine to bite into a lemon, do you start to salivate a bit even if you can’t see it in your mind’s eye? If yes, you can be hypnotized. If no, doesn’t mean you can’t, but it means there will be extra work.