Ok, new boat owner here. I have a 1994 Horizon 20' which I've owned for all of a month now. I've been out on it a dozen times or so since I've had it and encountered my first problem today. I was getting the boat off the trailer, put it in reverse and it wasn't getting itself off the trailer like usual. What do I do?? I push it off the trailer, put it in drive (with no issues) and putt over to the dock to tie up and park my truck. I'm coasting up to the dock (a little faster than I cared to), put it in reverse, and to my surprise the boat lurches forward and I smacked the dock straight on!
With all that being said, I start to do my checklist of things and come to realize that I don't have neutral or reverse. When I'm in neutral, it's still in drive. When I go to reverse, I'm still in drive.
I manage to get the boat back onto the trailer and get it home with alot of struggling and pushing, but it's here.
I start tracing the cables (figuring that's what it is) and I trace the drive cable all the way out to the outdrive motor. There is a cover on top of the out motor comes off to show where the cable comes in. I can manually put the boat in neutral, drive, and reverse with a socket wrench (there's a bolt that you can turn to select the gear). My question is, can this be a broken cable? What is involved in changing this cable?
I'm pretty handy with mechanical stuff. I've owned close to 20 motorcycles and don't have any issues tearing them apart. I'm not afraid to get dirty and I can usually put my crap together with little to no left over parts!

Has anyone experienced this issue? Anyone have any advice or pointers for me that I need to further investigate before I try and change the cable?