Painting in your garage can work if it is legal in your area. However if you have a water heater or furnace they need to be turned off and the pilot lights out.
I seen where a guy make a home made paint booth in his garage out of PVC pipe and a few inexpensive fans and filters. In most cases a garage isn’t clean enough to paint in and filtering can be a real pain. Not only that the over spray will get into anything and everything that isn’t protected. Dust will ruin a paint job in a hurry.
https://www.mckennasgarage.com/xke/jag_25.htm
Here is a link to the booth he created. One thing he did that I wouldn’t have is he had fans blowing in through a filter and also fans pulling the fumes and over spray out. I would have just had more fans pulling the air out and the inlet air just filtered. Personally I think this is a great idea for a economical painting environment. He give a lot of good advice at this sight.