See photo: are the rear drum brake springs in the correct positions?

The only thing I see is the top metal bar needs to be pushed up a little. It should be centered on the large anchor pin, then it will pop back another 1/8" and the two return springs will sit deeper behind the head of the anchor.

I still don't have an answer about that extra spring on the bottom.

As for cost, that sounds reasonable if someone had to drive out to your place. You should be able to put the other side together by using this one for a reference.

The two return springs appear to be correct. The only thing I can't see is the hook on the left end of the left spring. Judging from the gap between the spring and shoe frame it appears to be installed correctly. They could rub against the end of the parking brake strut.

If there is a pair of tapered wheel bearings in each drum you don't want to make the axle nut overly tight. Typically I crank them down as tight as possible with hand tools to be sure they're seated fully, then I loosen the nut, then tighten it again by hand. Over-tightening them causes the gear lube to squeeze out of the rollers resulting in metal-to-metal contact. You want just enough play to allow some lube to sneak in between the rollers and bearing races.

If the bearings use straight rollers the axle nut can be tightened more because it pushes on the inner race only. Nothing pushes on the rollers that will make the gear lube squeeze out.

Sorry to leave you hanging. Been out for a week fighting a kidney stone. This is my first reply now that I'm back on the computer.

It doesn't matter which return spring you install first. My personal preference is to install the front one first only because the rear one holds the adjuster cable guide, and it's possible for the guide to pop out. The hook of the spring keeps that guide in place. If you agitate it enough and that guide lifts out of the hole in the shoe frame, it will move 1/16" closer to the anchor pin resulting in the adjuster lever dropping low enough to no longer turn the star wheel. The only way to reseat that guide is to pull that spring off, set the guide in the hole properly, then rehook the spring to keep the guide in place. If you installed that rear spring first you also have to remove the front one to remove the rear one. Not a big deal, but that's why I install the rear spring last.