If you are trying a new movement or trying to increase a range of movement and you feel comfortable while working on it, you are not achieving much! Our brains are built to evolve and improve at the edge of ability, where we feel uncomfortable.
Especially when changing the movement patterns, we will feel uncomfortable at first and that is a sign that we are indeed changing something. One critical issue is, of course, making sure the new movement pattern is the correct one or at least better than the old one!
This is where this website aims to guide you, with lots of photos, descriptions, videos, checkpoints and feedback cues.
These are the stages of skill acquisition and how they correspond to the levels here:
Also, after acquiring a new movement pattern or a new range of movement, play with it. Don't just keep repeating it in controlled conditions all the time, challenge yourself. Try to repeat the same movement in harder conditions. Combine it with other movements in different ways.