The screw at the handbrake will not fall off. I think mine went about 15 turns.

Yes, you could try turning the star wheel inside the drum. It is at 4:30 or 7:30, and you will need a flashlight to find it through the lug hole.

The parking brake shoe is hung on the wear lip inside the rotor. You will lub the connector to the cables before you put the new rotors on.

Adjust the parking brakes after the rotors are on and before you try to tighten the cable at the handbrake.

The right side panel is not that hard to get off, just a pain. If you pull the bottom out first, it is easier, but that means the floor panels must come out.

For your leak, check the vacuum lines around the fuel filter - above the right rear suspension. With the rotor out, you should be able to see the filter easily.

Klaus
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My advice is 2 cents, so you got what you paid for...