On the basis it's not too late to chip in:
It is easier if you remove the floor panels, and the bulkhead lower centre panel (runs across the top of the bell housing), but possible to do without.
You need a long thin socket 1/2" AF (IIRC) which goes on the the bottom of the two bolts holding the slave to the bracket. These are difficult to get to, as they are enclosed by the bracket and close to the edge. You may have to grind the socket to make it thinner if it won't go on the bolt head. You need to be under the car to get to these bolts.
You will also need an assistant to somehow hold the nuts on top - I could get to the outside nut easily, but the inside nut is very difficult. A bent spanner would be ideal, but I wedged a large screwdriver between the nut and the body of the slave cylinder.
The flex pipe has to be undone from the top joint near the master cylinder and left on the slave cylinder, or just cut it. I would fit a new flex pipe as a matter of course as they usually decay inside, which leads to a soggy clutch action, and debris in the fluid which eventually knackers the new slave!
Leave the pushrod attached to the clutch pivot, and lift the slave cylinder out.
Reassembly is the reverse of removal as they say! However, don't forget to screw the new flex pipe to the slave cylinder before fitting to the car.