There's an old saying: "The camera never lies." Even if the videos that your phone records aren't that good quality compared to say, an iPhone, they are still letting you know honestly that you have work to do. When you practice in front of a mirror, your attention is divided. It's like your brain is split in two, partly performing the flourishes and partly observing yourself as you do. So, it's hard to get a brutally honest appraisal of where you are at skill-wise. When you are watching the replay of your videos, your attention is focused 100% on observing your performance, and so you are getting a far more accurate idea of where you are than when performing in a mirror. I believe videotaping ourselves, then watching, videotaping again, then watching, continuously repeating the process, is a great way to get really good and smooth. Each time it will improve. The other way is to perform for people as often as possible. If you ask friends or family to give you feedback, try to do it one on one, rather than in front of a group of two or more. People act differently in a group. Eventually you will get great if you don't get discouraged, persevere and really want it. It's just a process and it takes time and work - that's all. There's another old saying: "How do you get to Carnegie Hall?" "Practice, practice, practice."