Once you've tried the standard web ladders, you'll get it. Boarding practice is part of Day 2 of the Safety at Sea program.
Yes I have taken this and was amazed at how hard it was with the nylon wed to climb up.
I wouldbe looking for a 4 person as itys just my wife and I and mounted in front of the mast. We are only a 35 footer and dont have the space behind the cockpit
Thanks for the link.