Remove the starter motor.
Then undo the hex bolt on the side of the g.box. Then you should be able to get to the clutch fork arm dowel. Use a m6 bolt & thread into the dowel. Then slowly pull the bolt out along with the dowel. Then you can pull up the clutch fork out of the release bearing. This will not cause you any issues later when you try to separate the engine from the g.box.
You dont need to do anything to the g.box or its mounts etc. Other than the slave cylinder mention in the above thread.
There are 2 engine mounting bolts on the crossmember subframe which you need to undo & remove. So you may as well raise the car safely & tackle all the bolts which cannot be reached from above. So undo all the bolts that secure the gearbox to the short block. Dp from centre section & the dp from the back of the turbo. Unless you decide to leave this on. I prefer the dp remove all together.
The rest is pretty obvious, power steering, engine wiring loom connector, fuel pipes, coolant pipes, rad, aircon rad, battery etc.
As you have already taken off the inlet manifold then use the alternator support bracket to secure the clamps for the engine hoist. I would make sure the car is flat to the ground on it wheels when using the hoist.
Another tip for when you put it all back. Jack up the gearbox slightly then try to align the engine back. This way the engine mounting bolts will fall into the crossmember holes easily.
Ticky