In a world where technology for autos was still in its infancy, folks used their jack, tire irons, and a hand pump to do most tire repair. The tire was removed from the rim while the wheel was still on the car. Demountable rims eventually made a spare tire a reality but they have to be repaired as well. Sometimes it's easier to remove a tire while it's still on the car because it gives needed support for levering the tire bead over the rim.
Some folks use a plastic trash bag to remount the tire since it can be pushed right onto the rim with your hands in many cases then the bag is removed. There are You-Tube videos on this subject but many may be the demountable rim type. Rim protectors can be fabricated to protect them against scratching the finish.