You are most certainly not the first guy to enter the hobby having, or believing he has, lost all his skills at pleasing ladies. But see, it may not work like this with backpage fly-by-nights, but if you visit established providers whose reviews include comments like 'nice' or 'friendly' or 'responsive,' and tell them when you arrive that you would really appreciate some feedback to help you improve, then
1. So long as you're not a jerk, none of them will mock you for lacking skills (or at least, if they do they will do so quietly, on their own time, nursing their bruises);
2. Given permission, all of them will tell you if something doesn't feel good, and 95% will be just as happy to tell when it does, and how you can make it feel even better; and
3. The feedback you get will be expert, from women who have experienced vastly more than the average. More than one woman has gone so far as to tell me 'I like that, but every woman is different and if you see another provider you should also try this other to see if she likes it better.' Visit a provider whose profile says 'really bi' and those sorts of advices come easy. It can be a bit humbling if you learn some of those skills you thought you had before, weren't all that skillful.
And the great thing is, it ain't like sports or chess or the violin. You don't need tremendous hand-eye coordination, or the brain power to think 12 moves ahead, or innate musical talent, to become proficient. All it takes is willingness to listen and practice. And where else is practice ever this much fun?
But if none of that interests you, you are the one paying and you certainly have the right to ask the session be all about you and nothing else.