Take a lesson. A good instructor or coach can point out where or what you need to improve, and have you work on it right away. ["Here's what you need to do. But here's what you're doing. Instead, do this."] After watching just a video, we might "think" we understand how to do something, but getting out bodies to actually do it is another matter. Slow progression, frustration, and bad habits may result. The only risk to taking a lesson, IMO, is that can be a bit of a crap shoot as to the quality of the instructor you'll get. Videos are great learning tools, but nothing beats personal feedback and instruction.