Unscrew the door knobs from the vintage white doors. Spray the doors with an all-purpose cleaning spray. Wipe them down with a lint-free cloth.
Buff the doors with an electric sander using 220-grit sandpaper. Run the sander over the areas that have loose splinters and other major flaws. Rub the area down with a tack cloth.
Draw a horizontal line in chalk, 3 feet up from the mattress on the wall where the headboard will go. Run a studfinder along the wall, make tick marks on the horizontal line every place you find a stud.
Drill the bottom parts of two flush mounts along the horizontal line, drilling them each into a stud. Space the two bottom parts at least 3 feet apart.
Drill a top part of a flush mount into the middle of the back of each door. Slide each door along the wall, allowing the flush mount parts to catch and interlock and securing your headboard.