Hi there,
My advice is that you first invest a bit of time thinking about what kind of middle game positions you enjoy playing, and then find out what openings typically lead to that style of game. No matter what level of detail you want to study openings in, if you find them interesting you will stay motivated and remember stuff because it will start making sense to you in relation to the middle game. So start with the main ideas which you can get a grip on and gradually deepen your understanding. Of course there's trial and error involved, but you will ultimately get better results when you actually enjoy it.
Good luck
I really enjoy chess and have a lot of time to study. How can a build an Opening Repertoire quicly and easily without long hours of studying???