I put my 54" mulching MMM on for the first time today, with the salesman's help. He's a great guy, excellent dealership. What a pain! I couldn't believe they expect you to hoist a 105kg steel deck up by hand, line it up with the hydraulic tabs, and precisely place a pin into the holes, all while holding everything lined up by hand. I've got a bad back, so I can't dead lift 105kg, and not with one arm. I needed another guy to lift (the helpful salesman) while I wheedled the pins in. The front bar locking pin is also really fiddly, as my medium sized hand barely fits between the front and the brush guard to get the pin in.
All in all, not insurmountable, but not easy either. I'll have to hoist the MMM with my hydraulic jack next time I try it by myself. I wish the hydraulic had an "installation" setting, allowing it to drop low enough to engage the pins withe MMM flat on the ground.
I did cut about .5 acre waist high weeds, and it cut beautifully. Yes, I know, I should be using a rear rough-cut mower, but I only have to cut my weed field about twice this year, then lawn next year.