Not bad at all honestly. Golang comes with a built-in templating engine that was easy enough to convince me not to look for a better one. Routing is simple, especially if you're using the Gorilla toolkit's mux package. Figuring out how to work with database calls were tricky when I first started out because I was used to Django abstracting that part away from me, but eventually I really got the hang of it.

I would argue that the tricky part is session's and middleware. When I first attempted to build a golang web app that required session cookies I got so discouraged that I just swore them off and went with JSON web tokens instead. It also took me a while to wrap my head around the concept of clean middleware.

I would say it was rewarding in the end though, because I learned about some low-level concepts typically abstracted away by the framework I was working with. It's fun to know about these things.