Re: replacing boards and carpet
I did it in my garage, with the boat on the trailer.
I lowered the tounge of the trailer all the way to the ground, which raised the stern, I made a cradle from some lumber and used it with a floor jack to raise the transom up even higher. I put some jackstands under it to support it. I then raised the trailer tongue back up as high as i could get it, and then made another lumber cradle for the bow. lower the tongue for the trailer and the boat should be supported on the lumber and jackstands, with enough room to unbolt your bunks and pull them out.
This all depends on your boat, bigger the boat the more supports. I have a 17ft bowrider and got away with 4 jackstands and some landscaping timber scraps. Just go slow and be careful and you'll be fine