I learned the constellations by observing the night sky and used a field manual to do so. I lived in a darker area then, than I live in now. When I saw your photograph of Aries, ‘my sign’, I had a laugh as living near Chicago I have to use binoculars to see it!
Learning and seeing the constellations takes effort, but it is really not that difficult if you have dark skies and someone knowledgeable to help. The same skills used by our forbearers are required.