Don't be scared by zmbtech. You will get a mess for sure but that's the fun of it, isn't it?
I serviced the transmission of my C280 the first time last year. It was just as described by zmbtech. The most difficult part for me was to turn the crank shaft to find the drain plug on the torque converter. If you search the (old) archive, you should be able to find a lot of information. Or you can just drop a line here. I'd be happy to look it up for you.
Harry (94 C280)