For priming, especially with Akzo, you can shoot it outdoors with little issue. It dries super fast. If you're in a place where no one will care.
Since I do a lot of work at night, I actually bought a shed and made it into a paint booth. A splurge for sure, and it works pretty well, and is ready whenever. Can paint all the small stuff in there. I paneled the inside with tileboard, sealed up the trusses with plastic sheet, and added a ton of lights. I have a fan panel that fits under the rollup door. There is a partitioned off area for mixing and such and it has a window, so I just open that when painting to provide the intake air.
For painting the plane, I took two HF portable garages and made one longer frame. You can't buy PVC for the price of one of these (and I got them on sale). Covered it with plastic sheeting and used the roof tarps that came with the "garage" as flooring. Used leftover pipes on the sidewall to help with "pull-in". Again, added lights and an intake filter panel and big HF fan (those Walmart box fans are fairly useless). The fan shown has to run on low or it pulls in the sides and lifts the floor tarp.
I have the advantage of space. You can get by with much less for sure. I sprayed a lot of primer on grid tables on the driveway with no problem for years.