Reducing jitters by moonlighting is just advancing the start date. You should have the same jitters before moonlighting that you'll have as an attending.
As to the primary question, review your weaknesses starting with the most dangerous then the most commonly seen.
If you have the time go and shadow successful (fastest, fewest unexpected negative outcomes, highest rvu) people in your shop and take careful notes of what they are doing.
Devote time to your loved ones and others that you short changed through training so that you can remind them that you care for them. Also so that when you begin your written and oral board runs they don't feel hurt that your withdrawing again.
If you are moving states, review local psych hold, assault, and chemical dependency laws. Review local resources with the social work team like detox, psych placement, shelters, homeless resources, mechanisms for reporting child abuse, vulnerable adult abuses, and sexual assault care.
Find out about post mortem procedures if you are in a new shop than your residency, as these can vary quite significantly.
Ask your new chair what are the priorities for judging successfulness of attendings.
Potentially introduce yourself to the trauma surgeons (even through email), and the most difficult consult services to work with and explain that you'll be learning the ropes and appreciate any advice they may have for you.
Find out what documentation tricks attending use (macros, dictation etc) and practice optimizing it for yourself.
This is what I would have done in retrospect. It seems like a lot but is really only about one days worth of prep.
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