Hello

Don't worry to much, you can go on a RTW even if you aren't able to change a crankshaft bearing by yourself in a strong sandstorm at night.

I can change the oil/filter but I did it only once on a trip (many years ago just for fun), the mess with the oil is just to much trouble, the cost compared to the overall cost of a RTW a joke.
So give some money to a local mechanic/shop.

If you can take off the wheels and change a tube, that's all you need, because then you can also change other things on the bike.
If you can't change the tube but take off the wheel, bring this with the bus to the mechanic.
If you can't take off the wheel take all the tool, maybe someone along the road can help you.

I touch only screws where I do not need a torque wrench, but understand what Nm means.
So if in the book it says on a small screw in an aluminum thread 9Nm, I know that I do not hold the long wrench at 40cm and give it all I can.
Simple rule with screws, after fix comes broken.

In short, the more you understand your bike and can fix it the better, learn what you can, and just go on your trip.
If it is your first trip, start with a shorter trip for several weeks or months, before you sell everything you have and start a multy years RTW.

sushi

P.S.
Could please a moderater put all that philosophical bullshit about ZAMM in a separate thread.

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My RTW:
http://www.youtube.com/user/MrXt660ztenere