With the high cost of gasoline, and a need to stay fit...
There is a growing need for those experienced in bike assembly.
Called a "Bike Technician" or "Bike Assembler"
So how to get started.
Check out Bike Assembly videos on U-tube
Note that the bikes come in a big box with the derailleur gear installed,
The gear mechanism looks like this
So its just a matter of installing brakes, mud guards, seat and handle bar,
All in metric 8 and 10 mm spanners and a couple of screw drivers...plus a big crescent wrench for the handle bar lock nut.
This is a good job for any FReeper capable of turning a wrench,
Spokeshave who checked around local bike stores and they almost all hiring.
Also....tell the bike store you can be paid per bike....work off the back of the truck...part time is good.
A half days work at 5 different bike shops is excellent.
One last tip...get a receipt book made out for money paid so shop owner can file as a business expense
But the important thing is the phrase
Bike received in good order and passed safety inspection.
So if some idiot gets on one of your assembled bikes and is promptly overrun be a big truck...its not your liability.
"...There is a growing need for those experienced in bike assembly...." MTBF. Mean Time Between Failures. Because if you use it enough, everything eventually breaks.
If you cycle long enough, you'll eventually have a break-down on the road. I'm a little past a quarter of a million kms (road-only) so I've had a few.
Not such a big deal now because everyone carries a mobile phone and can telephone for help. Before the mobile became practical to carry when cycling, I decided I need to know how to fix everything on it. And the most direct way to do that was to build my own bike, from a bare frame. So I did.
One of the better aspects of that plan is it frees you from the tyranny of the manufacturer's specifications. Want nothing but NTN bearings? You can do that. Want your derailleurs from SRAM but your brakes from Shimano? You can do that, too. Want 180mm crank arms on a 52 cm frame? Sure, why not? Custom in every sense of the word.
Cherry-pick your parts, waiting till you can find what you need on discount, and you also can save a bit of money vs. store-bought. Which you'll need because you'll also be needing some tools you probably don't have in your handyman's collection. Crank extractor, bearing press (for headset and BB), headset removal tool, cable cutters, chain whips, cogset locking tool & accompanying socket. Some of them you can make do without but having the proper tool always makes the job ... tidier. And if it was you who built it (from scratch), there'll be nothing on it can break that you can't fix.