Beauty of writing your own checklist is that all items can be put in a logical order.
I have found in most aircraft having closed hatchess, adjusted seat, harness and brake on, most items follow a logical sequence clockwise across the instrument panel then down and back across engine controls and gauges then anticlockwise in the reverse direction after engine start.
If not using a checklist this is the procedure i have used on all the aircraft i have flown.