Never changed the clutch on a 166 but having spent the last couple of weekends doing a clutch change on my Mk1 on the driveway using A. Stands and ramps; suggest the following before starting.
1. Engine hoist to manouver the engine to get the gearbox out then back in past the wishbone/chassis arms etc.
2. Without the above, at least 2 high lift jacks to support engine and gearbox.
3. Fence post cut down to bridge two inner wings and H.Duty rope or better still a ratchet & webbing strap to support engine when unsupported by engine/gearbox mounts.
4. Correct drive bits to undo the driveshaft bolts and make very sure they are clean before attempting to release them, (do not round them).
5. CV Joint grease to repack the joints on re-assembly.
6. Consider new gearbox mounts if you suspect still on originals.
7. Pay special attention as you remove the gearbox on the position of the nearest driveshaft, so after re-assembly of the new clutch you do not end up with the driveshaft jammed in the wrong position!
8. You will need a mate to give you help during the removal and refit, ideally two.
9. Centering tool for aligning the pressure plate and clutch.
10. Label EVERY electrical connection and earth strap that you disconnect!
Suggest you take advise on whether with gearbox removed you also change some or all of the following, Crankshaft rear seal, Input shaft seal, Main shaft seal and Main shaft bearing. Consider also changing the gear selection bushes as some you will be disconnecting anyway to release the gearbox.
If you take the job on it would be very helpful to others if you posted up progress pics and descriptions.
Good luck (Fortes fortuna adiuvat 0:thumbs