Here we go again -
I somewhat agree with Floyd, however anyone can climb up on a Start board with a small sail and be sailing in a few minutes with some premiminary beach instruction. These days, it's pretty easy to get started, but it takes lots of time and practice before you are carving jibes in 20 knots of wind.
Same with water skiing, you can get up on two skis after a few tries, but it take lots of time and practice before you can carve tight slalom turns at 36mph. Finding flat water to ski on is a bit like finding good wind to sail in.
Actually, I did both for over 10 years, which was a good combination. Windy - go Windsurfing. No wind - go water sking. However, as I got better and better at windsurfing I lost interest in the water skiing and was paying too much for insurance and boat storage for the few occasions on the water, so I sold the boat. Plus Formula boards and big sails lowered the wind minimums to have an an exciting time on the water