I am ever trying to learn the art of Game Design through trial and error, or as I like to call it, error and error (which if you learn by making mistakes is twice as efficient).
One element of the design process that routinely throws roadblocks up in my path is the graphical development. When you start making your game, it is inevitably not going to look like a polished game unless you’re making text only interactive fiction, and even then you might end up changing the font. This is unavoidable and is something that you shouldn’t be worried about, but there’s a balancing act here whereby you need to get it looking like something you’re at least partially happy with, otherwise you’re not going to work on the game at all.
I am awful at working on things at the best of times, but I so frequently get stumped by the issue of working with placeholder graphics. I want the game to look like its polished state from phase one and that urge can damage development and general productivity.