Sometimes its worth paying for a few personal training lessons. A pro can spot & catch improper form (which btw is important in all forms of exercises). Another suggestion is to start with a lesser KB weight. Sometimes (or maybe most times) our egos get caught up esp when we're used to gym machines or even free weights. Strangely the weights we can normally & perhaps easily do may not transfer as easily to KBs. I discovered that while machines & other limited motion/isolating exercise target our strongest muscles (thereby allowing the largest weights to be lifted), KBs target the weakest. KBs are a full body full range natural motion workout which by design will target the weakest link in the chain. That's just physics.loserga wrote: ↑ ...sometimes maintaining proper (or safe) form and posture through these movements is something beyond what your muscles allow you to do, and so you actually need to target your weaknesses before you can maximize the impact of some workouts.
It took me a lot of trial and error, constantly referring back to videos and diagrams, to actually familiarize myself with the proper movements of a kettlebell swing, and in hindsight realized that I was using all the wrong muscles for most of my attempts. It was then that I realized that not only was my muscle imbalance contributing to incorrect posture, but it was also being reinforced by the exercise.
Another suggestion is perhaps to get some wall mirrors so u can watch your movements or perhaps easier & cheaper, just record it on the phone or gopro (or whatever clone). Once u watch yourself, u'll have a much better idea of posture & form. IMO ofcos.