I don't see why it wouldn't be, but the word 'someone' is doing a lot of heavy lifting here. Does your subject need you to project confidence? You might have trouble with that. Do they require a flexible, improv-driven approach? You might have trouble with that too. Is your subject the type to demand their most complex and intricate fantasies right from the word 'go'? That's on them, honestly, but like, also trouble.

Not every subject needs those things, however! Improv is a valuable skill to have when you're working with a lot of different subjects, definitely, but you can take a prepared script into a session and have a great time. I've worked with folks who do that, and it was a good time. Confidence helps keep a measured and steady pace, certainly, but you don't need to have that either. You can build up to these things with time, if you want - or you can just try and find your own style, rely on things that are closer to your comfort zone.

It's like any other skill - with practice, you can find out what your way of being a hypnotist is like. Maybe you stick to scripts, maybe you develop a reportoire of distinct techniques, maybe you stick to playing with people who have a clear understanding of what they need to go under. If hypnotizing people is something that you want, that genuinely excites and interests you, then practice is all it takes. You do need subjects who're genuinely willing to help you work on that stuff, which is easier said than done, but far from impossible.