As a self–taught designer, I was happy to discover that there is a structured process to design, as opposed to it being pure inspiration and creativity. The programmer in me was searching for logic and rules to fall back on; and patterns to be replicated at will. And I found that in design.
I haven't touched Photoshop in my life and don't know first thing about rasterizing images. But, so many things can be achieved by exploring the basics of typography, layout, and color.
As for inspiration, watching what industry greats do gets you there!