The problem with this job, is it requires removing a bunch of stuff that has nothing to do with the problem before you can remove that broken "B" shaped plate. You have to first remove the cowling under the steering wheel. Next, you have to raise the platform. To do that you have to unbolt it all up under the fenders, but you can't do that until you take off the side consoles and levers. Next, you have to lift the rubber mat, but it completely surrounds the hard metal hydraulic lines going to the joystick. I cut mine under the joystick cowling so it would not require removal of the lines. Also, you have to remove the seat because there is an access port under it to disconnect the 3PH drop rate knob. Oh yes, the toolbox also has to come off. Once you get the platform raised, you find the forward platform support is behind the loader post. You have to loosen the right loader post to remove the broken plate and shaft. You may be able to get the broken one out, but the fixed plate needs more room to install.
You'll be doing all of this on your own and not have techniques dealer's service departments have developed to make this a speedy job. If I were you, I'd at least get an estimate from my dealer so I'd know how much money I'm saving. Just remember, this is a relatively simple part and not complex in it's repair. It's just very involved with lots of disassembly/assembly. You could easily screw something up that would cost lots more money that a few hundred dollars at the dealership.