I merged your two posts together clockdon, please don't repost the same question. If no one answers your original and it is scrolling off the page, feel free to bump it to the top.
Replacing the cable is easy. Adjusting the cable is a nightmare. Better off paying someone to replace the cable and adjust it while you have the drive off. Boat shops make it sound like removing the drive is a lot of work so they can charge a ton!