What is the hardest, or scariest, project you have every done? (maybe it was scary at the time)
Even started (and didn't finish for various reasons - is it a UFO?)?
It may even be one you learned the most from or advanced your skills.
I did a quilt for my mom a few years ago with 240 curved seams. That was really scary when I started. I hadn't been quilting long, maybe a year. Bit the bullet and dove in head first. Nervously cut out all those curves. It was also the biggest quilt I had done at that point. Glad I did. It turned out great. Bonus: I'm not afraid of curved seams anymore.
Now, very very tiny applique. But I'm diving in head first. And I'm practicing and I'm getting better.