The world has changed and multi grade papers are much more the norm today, this takes away much of the need to adjust film development. Unless you are using single grade papers I'd suggest that you can mostly ignore +/- development.
With regard to exposure, incident metering was the best thing I ever did to understand reflective metering. Incident metering allows a great baseline to compare reflective meter readings to, with practice side by side it gets easier to see where zones fall.
Incident metering is still my primary choice for any shot that is truly important to me. What it provides is an objective measurement.