I agree with Roger... sort of. What he says is true although maybe a little intimidating.
It doesn't have to be intimidating. I used to give a quick piloting course in Boston so sailing club members could could take the Pearson 26's out and find their way around. This was back when even Loran was uncommon on cruising boats.
I started my class by telling them that I was going to tell them how to do just about 6 things and they were very simple. But, they needed to be able to do them when they were tired, when they were scared, when they were seasick, and with a flashlight held in their mouth. I could teach them in a couple of classes but the only way they could learn to do them well enough was to navigate every moment they were in the boat and do it in good weather when they could see everything and correlate what they were doing with what they could see.
Don't ask me exactly what those six things were, it was a long time ago and I'd have to give it some thought. I do know though that all the years I cruised without electronics, I didn't use any more methods than those. I think a lot of the courses try to teach you too much and to do it too precisely, as if you were the watch officer in a dry pilothouse with nothing to do except navigate and hold your coffee cup. When you are steering and doing it with one hand ducking the spray and trying to work the parallel rules on the cockpit sea, simpler methods work better.
The other thing I told them was, "There is no such thing as finding out where you are. There is just keeping track of where you are starting when you leave the dock." (Talking just about coastal piloting her. Using a sextant is all together different.)
You can take a course and pass it and go out on the water and be helpless. You can read a couple of books, think it through, practice in good weather, gradually increase your proficiency, and do quite well. That's not to say you shouldn't take a course but that what you do with the knowledge on the water and how intelligently and creatively you practice will be more important.
I reconfirmed this principle for myself when I learned how to fly. The navigation is similar but it happens faster. Because of my sailing experience, I refused to turn on the Loran or GPS for the first two years I flew and did everything on my lap. I developed a feeling for timing, and distances, and situational awareness that I never would have playing video games on the panel. When I started using the electronic navigation, I could tell that the two years of doing it by hand were absolutely worthwhile.