Watering at midday because that is when you remembered
Midday irrigation loses a large share of the water to evaporation before it reaches the roots, and droplets on foliage under full sun can scorch leaves. The fix is not discipline but automation: a controller or tap timer set to finish its cycle around dawn waters better than any human ever will.
Letting crews over-trim your palms
The carved 'pineapple' look, where healthy green fronds are stripped away, weakens palms, reduces fruit and invites pests. Green fronds are the tree's engine. Instruct any crew to remove only brown and dying fronds and never to cut above the horizontal line of the crown, and be suspicious of anyone who argues.
Laying new turf straight onto old ground
Paspalum rolls dropped onto compacted, salty or debris-filled ground will green up for a fortnight and then fail in patches. Proper re-turfing includes stripping the old surface, adding a layer of clean sweet soil, levelling, and verifying sprinkler coverage before the first roll goes down. If a quote does not mention soil preparation, it is a quote for a temporary lawn.