"Rome wasn't built in a day."means takes a long time to create something complicated or impressive. We have same saying in China. If you want something or some achievements, you must spend enough time.
I remember my teacher always told me a rule, he called that"10000 hours rule." It means if you want to be the master of some specific area, like: play a musical instrument,become an athlete,to be a success businessman,etc. You have spent about 10000 hours to training, practicing. That's about 10 years in your life.
Nobody can success without hard working, we all have the chance to learn something new, but 99% of us given up to keep working on it. So, no matter what you have right, just do whatever you like, step by step, you will get a fair result. Remember that "Rome wasn't built in a day."