It doesn’t matter how we perform; what matters is the way we do and how we listen to our body. Therefore we should never feel pain, and always readjust if needed.
There is no level or previous experience needed, because Yoga/Meditation/Breathwork is not a performance or a sport, it is awareness and presence in the moment. It is an harmonious dance between all dimensions of our being, involving all parts of our body. The art of “practising” is all about listening to our body with our heart rather than performing a posture with our mind.