I did an AOS on a 996, & it was a ballache to do. (Imagine papering your lobby walls through your letter box)
All in, it took me about 10 hours, but that was before I had the lift.
There are two different versions & mine was the one without the mini bellows on the bottom.
I used a ball end allen key, (6mm I think) Socket allen keys with a 1/4 drive ratchet & extensions to allow access from above.
I also had to modify a 10mm socket to allow access to one of the bolts which is partially overlapped by something. The socket was cut down at the open end, & used a grinder to taper the top end to make it a cone shape.
I also used a coolant clamp tool to remove the hose clips.
Like this:
https://www.amazon.co.uk/Clamp-Flex...ocphy=9046844&hvtargid=pla-699115112091&psc=1
Something else useful was a cheap USB borescope camera attached to a laptop which allowed me to look down the back of the engine where I was working as most of it is done by feel.
I might have done a write up on it, but not sure if it's on here or not.