A good question.
A local answer.

Allow daylight for coastal roads and rest between walks.

Map the first coastal stop and daylight before choosing a pickup location merely for convenience.

Give the coastal section enough nights for stops and weather changes instead of judging it only by the fastest map time.

Choose fewer overnight bases and a couple of standout walks rather than paying to move every day.

Read recent reviews for comfort and the operator's weather and cancellation policy before booking.

Read recent reviews for parking, heating and kitchen facilities so a lower room rate does not lead to extra daily costs.

Book accommodation where meals are easy to reach and set a daily turnaround point so a slow morning does not put the next check-in at risk.

Check forecast, daylight and accessible path details at your chosen lookouts before setting out.

Check rental return timing and traffic estimates for the flight day before fixing accommodation.

A guided day tour removes the driving but still makes for a long day. Read its stop durations before booking.

Stock up on everyday supplies in larger towns before remote legs, but leave room to buy fresh food locally.

For a relaxed day, prioritise a few lookouts and one meal rather than trying to reach every famous stop.