Windshield off and a few helpers can do it.-----Or I used 2 widowmakers plus comealong and flipped a 17' fiberglass working alone.----Perhaps videos are online as well
thanks for the info guys. what I wound up doing was making a couple 8ft. high gantries out of and using a come-a-long at the front and rear. It was an uneventful, very controlled flip. The hull is now upside down and ready to start sanding. again, thanks for the help.