Hi max, Laurel is pretty hardy,but when trimming it take your time,do it with secateurs and if you cut a leaf take it off because it will die anyway,what you can do instead of buying more hedging is lay some of the branches on the ground and weighh or pin them down and they will eventually self root,it makes a fantastic hedge but be patient and keep trimming it,it will then become a really dense hedge, Good luck, Ray
I wouldn't worry too much about a few yellow leaves it will always shed some leaves.



