Originally Posted by Rose_P

I have used a pin baste method that some dear one on this site described more than ten years ago. Instead of the curved safety pins that I find a bit stressful to deal with, I use long sewing pins with flat heads, such as butterflies or dots,, and hold them in place by sticking them into foam ear plugs. They very rarely come out without my pulling them, and they're highly visible as you go along. I lay out the layers and start pinning from the center working outward. The hard part is lining up the pieces, but you'd have to do that the same if you were spray basting. Spray basting gives me headaches - not a good sign. The ear plugs come in various colors and are sold by the jar full, I think 100, on Amazon and in pharmacy departments. They are reusable countless times, so a real bargain. One thing to note is that if your pins are not good quality, leaving them in your fabric for a prolonged time (such as in a UFO that got stalled at that point) could result in rust stains. If you're not sure, test one by putting one on a damp paper towel for a few days.
Aside story: In our previous house, we had a hide-a-bed in the sewing room. My daughter was staying in there one night and didn't know why I had a big jar of earplugs in the sewing room. She used a pair to get a better night's sleep because the grandfather clock was too disturbing.