It's just a few parts and a couple of levers. Nothing needs to be opened up. The tractor is already set up for it and you just add a few external parts. It really was no big deal to install and it comes with complete instructions. Adjusting it took the most time because I had to figure out how to put weight on the arms as I adjusted it. Hint...I did it with a Deere 100 lb front end weight and a cross drawbar on the tractor lift arms to hold it. Our friend duct tape held things while I adjusted.
The first install took maybe a couple of hours while the second one no where near as long and I don't think I put down my sandwich till I was partway done. it's been a couple of years so I forget some things but it was no big deal, except for adjusting it and the only hassle there was finding 100 lbs and a way to hold it on the drawbar/lift arms. Oh, the instructions said to remove the fender on mine but I never did and can't see why anyone would.
The cost was in the hundreds of dollars. Maybe $400 or $500? Messic's parts guys will tell you even though it might be a "whole good". Call and ask.
Go to Messic's site and look up the parts diagram for the thing. Search this site because I must have commented over the years and I know there were threads on it. Use the Google search box in the upper right and not the TBN search box. Since I am a vocal advocate of draft control I always had plenty to say when asked. it is a very useful tool and it allows me to do grading work that seems to impress casual observers who tend to credit me and not the machinery and invention of Harry Ferguson. But that's another story.