"Just Pumi Naka it" means take the first honest step, even if the whole plan is not finished yet, and learn from the attempt.
A phrase for starting
The line is useful when overthinking has become the obstacle. It does not mean ignore consequences. It means choose a small, reasonable action that teaches you what to do next.
How to use it
Say it before posting a first sketch, testing a harmless idea, trying a new hobby, or making the rough version that lets the real version appear. It is a playful nudge, not pressure.