SPS are easier than you'd think. All you really need is stability of parameters, light, and flow. Light and flow are easy, just get the right equipment. Stability is what trips most people up, but often it's because they're introducing the variation, versus the tank itself varying. Understand the important nutrients (Ca, alk, N, P, and possibly Mg depending on stocking and water changes) and how they're kept stable, and you're golden. Don't dose or remove anything without being able to measure, and without understanding an appropriate dosing or removal rate to get your target. Test, adjust, repeat, and eventually you'll learn the patterns your tank needs.