How hard would it be for an ape like me to put a few metres of fencing to a standard that's good enough to keep a dog in and not topple over if a chunky cat walks along the top of it? Would all be along one side of a garden.
Not very. Big 'ole for each fence post, at appropriate distances from each other, bag of post mix in each, use a big spirit level and a string line to get the (treated) posts plumb and in line with each other. Allow to set. Apply fencing (panels or featheredge etc) to posts.
How hard would it be for an ape like me to put a few metres of fencing to a standard that's good enough to keep a dog in and not topple over if a chunky cat walks along the top of it? Would all be along one side of a garden.