I would be nervous to sand as well. I have sanded old stuff and after realized it was not wise. I did it outside so not as bad as if was in, but still after I got myself freaked out.

I want to buy a tent to use as a paint booth but would still be for outside in warmer weather. I don't have a place for winter. I have only done spray cans, I am interested to hear what you think of the sprayer. It would open a lot of options...