I see that the landing distance from 50 feet is 1215 ft.
You don't have to be at 50ft over the threshold.
If your calculations look 'tight' speak to someone who knows the airfield and the aeroplane and ideally you too and get their advice.
As time goes on and you will gain experience from both flying on your own and with a good instructor you will become better and more comfortable in operating into airports and airfields that are less big.