Ask HN: What's the learning curve like for AWS Lambda?

I'm starting a new web API project and am considering using Lambda, but my knowledge of it is limited. I'm worried that the coding will be hard, or at least the learning curve will be. I'm also worried that hiring Lambda developers will be hard.

I'm attracted to it so that I don't have to constantly fiddle with my AWS configuration to avoid wasting reserved instances.

I'm also attracted because of the potential to make a lot of the complexity of scalability go away.

But I'm scared of Lambda because it's so weird. I don't know what I don't know.