Is this Leylandii?

@YellowLab please, unless you are chainsaw trained do not attemp to do it yourself with ropes... Handsaw maybe but then you have to get rid of it all...
My S in L has built up his own arb business over the years. (In my signature..) I don’t know where you are but google tree surgeons in your area...
Safety, tree knowledge and technique are really necessary.. Get a professional in who has full liability insurance.... For your own safety...

 

Ha @YellowLab no sorry Cotswolds.. Get on a laptop or PC and have a google or get someone to do it for you as there are bound to be some tree surgeons in your area but make sure quote is free and they are fully insured... No harm in checking it out and paying just the onceif you go ahead.. Plenty of other things to plant..

 

Nowadays you can get good stump grinders that are small enough to get through gates. Although they weren't limited by space this is the one they used here.