You don't need special tools. You don't need special knowledge. If you can fix a logging skidder you can fix a bike. Bring that thing over here, son! We don't need to pay those frou frou idiots at the bike shop to chip their nail polish and charge us out the wazoo!
When they finally brought the bike to me because they couldn't get the crank off they had already tried a hammer and a torch. The scorch marks were just amusing, but the bash marks damaged the threads in the crank arm so I could not use a proper puller. I ended up using our "one-way trip" crank puller: a two-pronged chisel that goes behind the crank arm, where it will actually work.
People who find the workings of a bicycle impenetrably mysterious represent one end of a spectrum. The people who sneer at the complexity of anything without a motor are at the other end. The repairs improvised by contemptuous mechanics sometimes exhibit the crude effectiveness of a chunk of stone lashed to a stick with a piece of rawhide, but more often they're just a prelude to a more expensive trip to a real bike mechanic after the dismissive Mr. Fix-it has made the problem worse. You can tell when a tinkerer has made a mistake that will help them do better, more sensitive work in the future and when someone who would rather be doing something else has simply bashed it until it either worked or went away.
I have my days when I would rather be doing something else, but I know enough to try to do good work so when the bike goes away it goes away happy and stays away for longer. I really could spend hours just staring out the window, if I could figure out how to get paid for it.