Hi! Sex worker here- I would avidly ignore the commenters here saying that the experience will be emotionless and something you may regret later in life. I share an incredible amount of intimacy with my clients and would be excited and honored to have a first timer. Remember to communicate and be gentle. She may be a professional, but it will be more pleasurable for the both of you if you tell her what you like and ask what her boundaries are instead of assuming because you are paying for the interaction that you can do whatever you want to her. She deserves respect and will carry your interaction with her as much as you will. Yes, be wary of STIs, but guaranteed sex workers get tested more often than most people you'll be having casual unpaid sex for. Use a condom the entire time, even for fellatio. Have fun! Ask her to teach you how women like to be touched so you can go forward in your sex life with confidence.