Did my first fibreglass work on the rudder of a 1980 - 27 Cherubini Hunter by stripping the glass off one side and gutting the foam, replacing the foam and reskinning the rudder, trial and error, a poor selection of tools but I got it done, next re-cored the foredeck under the mast step, that job went much better so much so that the buyer couldn't find my seams in the glass ( the boat is still operational in my area and that was 13 years ago. The interior job on the 35.5 was my third go round, good tools, good advise and time was what it took. Templates for the flange and the bulkhead and lots of time in dry fitting, tabbing, glassing. Use cheap materials on the first two jobs, all good stuff on the third. So experience was nil on the first one and acquired over the second two. Have subsequently taken courses at a boat school in Maine and have done work on friends boats and my present boat. Built an external rail mounted propane tank locker that I re-enforced with corecel foam and I'm now playing with molds for locker/lazerette covers and solid hatches. Loads of good stuff on U-Tube but my Go To Instructor is Andy from Boat Works Today, play the video, pause, rewind and get it done.