Oh dear.....
To get to the slave you will need to get the car as high as you can (tall jack stands) and use a creepy-crawly. You will need to remove the left drive shaft as there is no way you can get the servo out with it in place, plus it will give you some "swinging room".
There are three nuts to remove the bracket holding the servo (#16) they are 13mm (#17,18). You will need a long (2' 3/8th) extension to work across the top of the box to get to them.
Pin #22 needs to be removed. I found the split pin (#24) the hardest thing to get to and remove. Use side cutters but you will have very little room. Get one of those mirrors on an extension to help you see, but I found in the end it is better to close your eyes and work by feel once you understand the layout. Don't forget to separate the vacuum line from the servo (tricky depending on where the clamp is orientated). This is all you need to unfasten/remove to get the servo out.
As for adjusting the clutch lever? It can be done... in time
In the end, I didn't have to adjust my clutch.
This is really a ba$tard of a job made whole lot easier if you can gain access to a hoist. But I am proof that it can be done on the garage floor.
John.... think really carefully about removing the engine and gearbox. Now is an ideal time to get rid of oil leaks/clean/repair all at once. I know it is daunting but you will be suprised how simple it is once you've done it.
I'll pm my mobile number to you in case you need to ask me anything.
Cheers