Why wait till spring? Why are you painting the hinges?

Why are you spray painting at all?

It takes YEARS to be able to spray properly

When I have to spray indoors, I get a very large box and spray inside the box to catch the overspray.

Another way to do it is to set the hinges on something that you can carry - like a shallow cardboard box. You set the items apart on the box, step outside, spray, then carry the box and can back in.

When I am spraying small items, I find that toothpicks are useful in keeping them in a certain position to allow the spray to hit them, and I will also rest the item on flat toothpicks so the paint doesn't stick them to the cardboard surface.