Bitter experience taught me always to check much more carefully if the aircraft was directly off maintenance; check that no nuts are loose, and wirelocked properly where required; check that any belts are correctly fitted, check that the prop is not on backwards if it's possible to fit it backwards (yes, it's been done), check that all wires are secured properly; in short check everything that a rushed mechanic might have missed or not reassembled correctly, as well as checking what the handbook lists, as you would at all other times.
It follows that you have to be very familiar with what's under the hood, and how it looks when everything's present and correct.
Draw fuel off the water trap until it's clear of water. You need your personal baby food jar for this in your nav bag.