It is not difficult to install. Just give yourself enough time, and you don't have to do it all at once. You do, however, have to finish it before you take the boat out again.
If you can't make sense of it Larry Mann is quick at getting back to you.
If you need to drill any extra, or new, holes in the steel it is not easy. The stainless is of very good quality and will very quickly dull whatever drill you are trying to use. You shouldn't have to drill any holes.