Mate, you don't mention if you're sailing alone, or with a club. If you're with a club, then GO. How else will you learn??? Your fellow sailors will be sure to shout useful
advice at you when you go wrong. If the other
boats aren't out, then get an experienced sailor to come with you as crew, just to build confidence.
Just stay away from the rocks. The sea won't harm you!
Personally, we rarely take our beachcats out in less than 25 KNOTS now... 25 kmh is just so lame!