I did mine not long ago to fix a leak between the plate and the block. It's the 2 o'rings that harden and flatten over time. Mine's the T engine so it's a 55mm crank nut & 500 nm torque. It's also auto so no way of doing it properly without taking the engine out.
At my age, I just couldn't see myself trying to work over the bullbar or on the ground.
It's not always easy to get the tapered cone on the crank to let go. I'm sure you know that you don't use a puller on the crank pulley. It just slides off once the cone is out.

It's not a difficult job if you get your timing lined up first. The longest thing to do is getting the old gasket scraped off.
The pump gear comes off easily if you use 2 of the longer 8mm bolts from the cover. just wind them into the threaded holes until it pops. Leave the nut loosely on.
When the timing is on TDC, the woodruff key is at 11 o'clock so little risk it will drop out.

I took a few pics of mine if you want to see them..