According to my fragments from a sevice manual, you will need to remove the hydraulic lines, steering linkage, electrical wiring, and, if applicable, the front driveline. The manual also says the steps and operating rods for the brakes and clutch. It doesn't mention the throttle linkage.
I haven't split any of my YM240s/2000 yet, but have done a very similar machine in a Ford 1700. It is straightforward if you are careful. I found it well worth the time to remove the steering column to better align the halves of the tractor. A strong helper or two would be really nice, but not mandatory. I was thankful to have a spare floor jack and a couple 2x4s to help wiggle the thing around. I was also stupid, and did it in a rough dirt field.
There might be more than 4 bolts. Check everywhere, especially places it would be difficult to access. I had to pull the fuel tank and dashboard on mine, an unexpected nuisance.
Please, please, please take detailed, step by step pictures of what you do and how you do it, and jot down notes so you can give us a thorough writeup when you are done. A pair of reasonably competent weekend mechanics with a decent set of tools could do the whole thing in a full workday.
It took me almost 7 hours of work time to do a clutch replacement on my tractor, which had a loader on it. A significant amount of that would have been reduced if I had not been alone; another set of eyes or hands would have saved me at least an hour, likely 2.