Once you become a board or PCB engineer, you'll see board design is not complicated at all. But lots of engineers find it difficlt to start on this path, especially trying to do so by himself. Why is that?
To me, one of the reasons is PCB design is normally not covered in college classes. It is simple and not much theory behind it. In addition, doing PCB design means you have to get the board made somewhere and test/debug the board by yourself to learn the lesson, which is difficult for a self learner.
Finding a company, working in a team, and learning from others is always the best way. If you can't do so or at least not at the begining, it doesn't mean game over.
read book, find and use eda tool, use others' boards, etc. **broken link removed**