How to Use HRV to Prevent Overtraining and Improve Recovery

I have been tracking my Heart Rate Variability for a while now using my smartwatch in London but I am not entirely sure how to use HRV to prevent overtraining. Some days my score is very low even when I feel fine and other days it is high but I feel exhausted.

I am trying to follow a strict powerlifting program and I want to know if I should actually skip a session when my HRV is in the red. I do not want to be lazy but I also do not want to burn out. My coach says to trust the data but sometimes the data seems to conflict with my perceived exertion.

How do you all interpret your morning readings? Do you have a specific threshold that triggers a rest day or a deload? I would love to hear how you integrate these metrics into a heavy training schedule without becoming obsessed with the numbers.