This is especially problematic when the hedge I am trimming has not been trimmed in decades. Any sugestions? Thanks for your advice Michael
Fix a post at each end, and tie a piece of string taut between them, at the same height on each pole. That'll give you a guide line. Don't cut inside where there is green foliage; if you cut into the interior brown, it won't re-grow.
Yes, if you are planning to saw through it several feet below the existing top you will end up with a "dead zone" on top.
