Rusty's not far off! an engineering ability to temp fix things until you can get to a mechanic. although i wouldnt use the word bodge. botch is more fitting. A bodger is more skilled
Cassie I am off to Morocco on saturday for my 1st overland trip and i am only taking limited spares, this due mainly to the fact that I have replaced a few parts (suspension/radiator/wheels/tyres/brakes etc allready. therefore i do not feel that i need a huge amount. The key here is to fully service the vehicle before you go. all fluids, all filters, new brake pads/hoses, radiator hoses, coolant etc. In doing this you know that worn parts will not fail on you. I have kept the old brake pads/pins and hoses for spares. some radiator hoses and the plugs off the old rad. old serpentine belt.
The other thing to realise too is that maybe you should only take what will completly imobilise you. no point taking a propshaft, because you can disconnect it and drive in diff lock to the nearest town. etc etc.
so ontop of my 2nd hand spares

i am taking propshaft UJ's, hub bearings and spare filters. thats about it. however remember i am only going to Morocco and worst case senario is that i get towed to the border and use my european cover to get towed back from Spain. Where your going may be a different kettle of fish. You have to assess where the furthest point away from any major town your going to be, would a break down be life threatning or just a PITA? This should decide what spares you take. also, availbilty of parts where you are, whats around? although with airmail, DHL can have you a spare alternator within 24hrs!
As for tools. I have loaded up a tool box with all sorts! along with a 1/2"drive socket set and 2foot breaker bar. Again only take what you can actually use. no point taking a multimeter if you dont know how to use one! or hub bearings if you dont know how to change one!
Its a good thing doing them classes, should teach you alot. I learnt the hard way with my old 1985 90. pretty much everything broke and i fixed everything myself (except ignition barrel). This has stood me in good stead for my reliable 300. I think it just comes down to experience. You learn how to fix things, the right tools to use and how to handle them.
along with this, i have the contact numbers from a few guys here for advise if i need it, along with my local indi (who will send spares to Morocco if i call at any time of day) and the local LR dealer if i get really stuck!
Just remember you wont be able to take everything, and you cant prepare for everything. Just take what you can fix, what can get you to the next town and try not to double up on tools if ness.
Thats my train of thought for prep for Morocco/Western Sahara anyway. Will let you know how it goes!
HTH
G