Check the Drone Map, NOTAM, and AIP for any newly imposed restrictions.

Check yourself (no alcohol, drugs, fatigue, or injuries, etc., that may hinder).

Check the weather (wind, precipitation, cold, thunderstorms) and lighting conditions.

Ensure the drone equipment is complete, fully charged, that the right cables are included, and that you have high-visibility clothing.

Bring twice as many fully charged batteries as you think you'll need.

Bring at least two memory cards, as sometimes they may not function.

Bring extra propellers.

Bring warning signs, cordon tapes, etc.

Bring spray paint (for ground/flight support, GCP).

Don't forget your drone license!