Bless you my boy. The Norton Commando is truly a motorcycle made in Heaven, and there can be no more noble a cause for a man (or woman) than to bring a neglected Commando back to life.
All the POSITIVE replies above are excellent. These bikes are really quite simple compared to modern whizzers. With a workshop manual and this forum to refer to, you should do well. Triumphs may blow up but not Nortons if they are carefully assembled.
What you will need if you do some dismantling is an array of special tools - eg clutch spring compressor, special pullers and drifts etc. Most of these you can make yourself, or borrow from your local club if possible. It really helps to have a lathe (or a friend with a lathe).
There aren't too many things to worry about except for:- sludge traps (crankshaft), main bearings, layshaft bearing, isolastics, swingarm spindle, migration of gearbox oil into clutch, fork dampers, carburettor slides, evil fuel in your fibreglass tank etc etc. No problem.
Isolastics are particularly important for good handling. I just removed the original rubbers from my 1970 C'do during rebuild and they were like pieces of marshmallow. To my shame I have not used my bike for a long time and it punished me by refusing to run properly. Perhaps that was a good thing, as it prompted me to strip it down completely and fit a lot of new parts.
Hope all goes well.
Martin