Just don't do it.
I see the point, but to some degree - we all got where we are by trying something new and a bit out of our 'familiar zone'. That being said - everyone's comfortable with different things - and there's a significant difference between being unsure of something and being uncomfortable with it. Unsure can be fixed with time and communication and learning. Uncomfortable MAY change with time, and learning - but if you're uncomfortable, not just unsure, than it's definitely not something to try - at least right now, until that changes, if it ever does. Only you can answer which applies in this case, so you will need to consider it.
If you decide you are comfortable enough to try, I think the key is (yep, I'm going to say it - the same thing I say everywhere else) communication. Be honest with them. Tell them it's not something you've tried before. Talk to them about how they feel about it - what excites them about it, what they expect in general, etc. Take it slow - start with short, simpler scenes, featuring less intense regression. Communicate AFTER the scene - talk about what happened - their headspace, your headspace, etc. Be open and honest. Make sure that everyone knows, going in, that particularly since you've not tried this before, should you decide this isn't for you and you'd rather not continue, that has to be ok - just as ok if they decide not to continue it either.
With that, you stand at least a reasonable chance at being able to learn something new, and something you might come to love 😃
Have fun, stay kinky!