When working on clairs you don’t focus on your chakras that’s the first mistake people make. You work on the abilities themselves and the chakras will improve with your progress. There’s a how to scan guide on the forum as learning to scan is a basic thing all practitioners should touch on as it works out all your clairs, sight, smell, hearing, taste, feeling. Focusing on the major chakras unbalances your energy system because not everyone has the same amount of chakras nor the same locations, and people always ignore the minor chakras.
Learning to scan; especially yourself helps you recognize how your energy system works as it most likely will differ from another, how your energy flows, what it looks like, feels like, how fast or slow your energy is vibrating on (neither is good or bad) if you have any stagnation, etc. these things tend to lead to external scanning which is what you’re doing when you commune with external forces like demons, angels, yokai, gods, Djinn, fae, etc.