We’ve got a massive leylanii hedge on one side of the house, one of the covenants when they built the estate was apparently to have a huge hedge to screen us from the posh people.
We cut/get it cut every two years. Getting it cut was £150 (25 foot tall by 30m long). Bloke wasn’t too keen to take the job 2 yrs later mind you!
I’ve done it twice, once with a petrol hedge cutter and a ladder. I’m lucky to still be here. Once with a mates Schtil hedge trimmer on an extension pole and a mini-scaffold/work bench thing. Much easier! I would do the whole helmet/ear/eye protection thing… Bits everywhere.
As gas been said above, the cuttings only half the battle. Collecting it up and taking it to the tip was another story.
I’d only take off 30cm as we have a couple of brown patches where I lost concentration!