Paul: rather than putting your email in the post, it's safer for Andy to click on your name then select "Send Email". So you might like to edit your post to hide your address from spammers.
With my P21, I've launched it on my own just once - on a calm day. I was in tidal waters, so reversed the trailer in so the boat wasn't quite floating, then waited for the tide to rise. I even managed to keep my feet dry!
Presumably - in non-tidal water - you leave the boat tied to the trailer until you're ready?
But usually I have help, which makes it a doddle.
Geoff
Parker 21 / 18 Dawn