Wow, I had missed Por-Fin's thread. That's impressive! I wish I had those skills and tools!
Skill and tools are both accumulated by doing.
Something to think about, as Med pointed out: This ain't rocket surgery.
Now, that doesn't mean that there is not some precision and technique involved, but these drivetrains are a whole hell of a lot simpler than the drivetrain in the average 20 year old car.
Average yard shop rate is $90, and a good mechanic is worth at least that,
1. when you need him,
2. can afford him, and
3. when your time is worth more than his time.
But if, like most of us, your life rarely sees the intersection of more than 2 of the 3, getting your hands dirty is both necessary and satisfying.
And it takes far fewer tools and less money than you think.
4 hours of labour at $90 will buy you:
A decent quality socket set with 1/4" 3/8" and 1/2" ratchets.
A good quality torque wrench.
A breaker bar.
A pry bar or two.
A dead blow mallet.
A good set of box end wrenches, stubby and regular length
A set of good screwdrivers, that you can turn with a wrench.
A tool box to put it all in.