I recently bought a mini chainsaw I use it to cut the thicker stems in the confer hedge that the normal hedge trimmer can’t cut.
It's not the weight/size of the chainsaw that I have a problem with at the moment - it's the limited movement in my shoulder that's painful when I stretch and rotate.
I doubt a mini saw would be much use in taking 6 ft off the top of this hedge...
( this is after it's been trimmed today btw)