I actually did the 2nd paragraph recommendation first. I was able to smell the gas (faintly), but engine still didn't start.

I was afraid the spark was too weak. At that point, I squirted fuel into the carb out of despair and flipped. Then the engine started a few turns, then stopped. I did it again. This time it worked.

I must have flipped the prop about 100 times that day, maybe 50, anyway countless. My shoulder was sore for a few days after that. Now I know better.