Remember that a good approach into a poor field is better than a poor approach into a good field.
That is the essence of the whole thing, getting the aeroplane onto the ground safely, if you then go through the far hedge, well it is better to do that at 20 knots than hit the first hedge at 80kts.
When teaching PFLs, don't try to teach the student the whole thing in one lesson, get them used to selecting fields and setting up and flying glide approaches , then introduce the drills and radio calls , pax briefs etc.The aim is to stay alive, saving the aeroplane is a bonus