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Not knowing any better, I took it standing up. HRV=48, HR=67. It had instructions about when to breathe in and breathe out, and I didn't follow those - the respiration rate as indicated would have been artificially fast for me.Yes, generally read at rest, either lying down or sitting. For people in really excellent aerobic condition (Ironman triathletes, for instance), they recommend taking the reading standing, just to get enough stress on the heart to measure a difference from day to day. Either way, the goal is to be consistent with your reading so your morning reading indicates something about your NS state, which therefore (theoretically) indicates something about your degree of stress and recovery.
Other than the morning readiness reading, you can take a reading anytime during the day while doing anything at all. You might try before, during, and after a Buteyko breathing session, for instance. I think you'll see that a breathing practice session increases your HRV.
As for skipping a beat, I think it's unrelated. My heart does that too, but only a few times per day, so it's unlikely to happen during the 1-2 minutes I'm taking a reading. If it does, I suppose that depends how the algorithm handles it as to whether it affects the result.
Based on the chart here: Heart Rate Variability | The Ultimate Guide to HRV | WHOOP it would seems I'm at the high end for my age.