Two light stands and a crossbar between them. The backdrop slides onto the bar through the sleeve along its top edge, then the bar goes up on the stands.
Slide the backdrop onto the bar first, on the floor, then lift the whole thing onto the stands. Doing it the other way round means holding a bar above your head with one hand.
Let it hang for a few minutes once it is up — most creases drop out on their own.
No sandbags needed indoors. Do not use it outside in wind.
Two minutes, and you'll know either way.