I've never tried it on a skeg boat so practice on the water to make sure the skegs don't bite in and try to turn the boat.
We used to have to back Dart 18s out of our slipway because of two large concrete walls; it works fine as long as you sit on the noses to get the skegs out and hang on to the bridle wires to stop falling off - it can be fun in chippy choppy sea...