I remember a forum discussing this a while back
I wrote a short reply relating to the judging of gliding distance to landing area.
Try this. Pick a spot on the spars, or in low wing aircraft ,the wing tip or similar when you have this point established, just pick any landing area in a circle under this mark. Higher you are the wider the circle. And visa versa
My mark is just under the pitot tube on the right strut. Allowances must be made for pilot height, cushions etc. also a slightly lower point if heading into the wind.
Really works, takes the "will I make it scenario" out of the equation.
I have to agree with the previous comments, all good with practise.
Phil.