Not that difficult. I've replaced two using the Haynes manual as a guide.
Remove the battery and battery mounting bracket. Also the air cleaner inlet duct.
Locate the clutch release lever and slacken the locknut and knurled adjuster nut on the cable end.
There is an inner and outer cable. Work the inner cable fitting from the clutch release leaver and the outer cable from its mounting bracket.
Inside the car, remove the small shelf under the steering column.
Unhook the inner clutch cable from the hook on the top of the clutch pedal.
Back under the bonnet, remove the cable from the bulkhead. Have a good look at the way it's routed and the various clips that secure it before taking it all the way out.
Putting it back is more or less the reverse of the above. Hooking it back on the clutch pedal is a little tricky but you're probably a little more agile than I am. See the photo for a look at what the top of the clutch pedal looks like.
Has the clutch pedal snapped or broken somehow?
Anyway, good luck
S