You need to have most of this in the back of your mind already.
Do the work on the ground. Tidying up the fine points during the flight is easy.
Give yourself a long holding pattern if need be, well trimmed, and with decent knee board or writing board it’s easy.
but always work from having the big picture on where to go.
In your preflight planning, note your diversion fields, list their bearings and distances from each appropriate point on the back of your plan or somewhere else handy.
This will be relevant for the rest of your career....