I have a lady friend that I good time with and talked her into it. Search out sites that describe others doing it and discuss them with her. Urine has nothing in it that will make you sick. The stories I found detailed how to prepare for the session. They recommend that she drink a lot of tea for several hours before doing it. It cleans out the system so there is no smell that may be unpleasant. She ended up drinking several large bottles of water and vodka eased the tension to go when we were ready.
I determined I wanted a video of it so I purchased a soft water proof mattress cover. We stripped the bed and put the water proof cover on the bed. I slipped a pillow under the mattress cover and laid my head on the pillow. Figure on several hours of drinking an excessive amount of liquids before hand. My first experience was with Yummy Marie in the bath tub but the damn tub was cold on my back so we just did it from the mid section down. Swimming goggles are a must to keep the pee from getting in your eyes.
PM me if you have further questions.