Help with endgame drill

my help, rough as it is, is to tough it out
it make take a few dozen attempts but you will get it eventually
the learning is in failing the drill over and over and you will begin to see the big picture
the reason i know this is i asked my coach pretty much the same advice on the same problem/drill
and he told me what i am telling you
the thing that helped me was not to try and beat it in one sitting- if i wasnt getting it i would walk away and try again later
i remember that drill took me a few weeks to get