Depending on your boat layout and size, there are options.
*Carpet goods are available in standard 12' widths. 16' goods are available, but those usually have to be ordered through a carpet store.
*The backing of the carpet (as stated) is generally the tan jute woven backing, which is fine for anything interior. Marine carpet has the black foam/rubber backing which is also treated for mildew repellancy.
*Your carpet may (or may not) have tacking strips in place such as a house would. You won't know until you remove the original flooring.
*You don't have to use a kicker if your hips or knees aren't up to it. You can rent a power stretcher, which is a racheting carpet stretcher that positions itself against the opposite wall for stability. Takes a little longer, but is easier on the body.
*Google 'laying carpet' and see how the final cuts are made to ensure a good fit. There is a special tool for it and it's not that expensive. Makes short work of the cutting. Also look into the videos for seaming carpet as well. Keep any seams in low traffic areas.
* You will probably also need an air stapler & small compressor for any stairs, hatches, and closet areas. Beg/borrow/rent one from an upholstery shop.
I found carpet installers very competetively priced. My quote was for $400 to redo all of the carpet in a 37' Carver. That was for removal & reinstallation. Not worth my time for that.