I did a bunch of perspective work on this page, and it got me thinking about tools and obstacles. When you don't know how to do perspective well, it feels like a difficult obstacle -- a hard thing that will make your work look bad if you don't follow all these fiddly rules. It's like a set of hoops you have to jump through just to make your work look passable. But then when you get to learn how to it works and get used to it, it feels more like a tool instead -- just follow these rules, and everything will come out looking nice!
I imagine a lot of things might be like that. For instance, when I work on film projects, I always find lighting a big challenge. It's a struggle just to get things acceptable and avoid making terrible weird shadows on things. But I imagine to a skilled cinematographer, lights feel like a useful tool for making the picture just right.
Learning to do things is nice.