Dad bought a 8 foot, single sail, swing keel row boat. He filled the mast with foam so it would float. It was a mix and pour concotion. He poured in too much and it over shot the top of the mast. Raw product fell on my sister and cured in her hair. I just took the boat out. Had a lot of fun fishing under sail too. Years later it was sailboards.
Now I singlehand a daysailer. Sailboats are one out of hundreds in this neck of the woods. My next boat will be blue water capable.
Short answer: Just did it. No instruction. Just work it until it works.
p.s. Thanks for all the good information here at sailnet, and to all the informative posts.