Mark,
I just replace the shift cable on my 91 vision 36. It was not easy, but it was not rocket science. I took pics with my cell phone as I took things apart, and I lined up a new Teleflex cable of the same length. The hard part was pulling the old cable out, it was cable-tied in unreachable places. I used a 14 inch bread knife to reach the last cable-tie deep under the aft berth. I came close to disassembling the entire berth. I tied a nylon line to the cable to have a way to pull the new one through. The lever end of the cable is different from the transmission end, so be careful to send her through the correct way.
I decided to not send it through using the nylon runner, I just pushed it through and fished it out as needed to get her in. It was a PITA, but I got it done alone. Luckily I had access under the cockpit from the aft cabin, and the cable goes up into the aft lazzerette and then under a removable deckplate in the cockpit, so it was semi-accessible on my boat. Shifting is much easier now. I hope this helps.