How are you installing it Blokes doing equine stuff with a post nocker could be as as low as 15 a linear meter doing a few hundred meters that's including 2 rails but probably on half round rather than sawn
Depending on how far below ground level and what the ground is could you snap them off and move along half a bay and get someone to knock them in Would save a lot of work as posts always break without removing the concrete anyway and you end up with such a large hole trying to get it out
done shit loads of it for a horse sanctuary i worked for all knocked with a tractor mounted king hitter in at 6ft spacing's and 3 rails. 3 man team one driving one on the controls and then a twist and plumb guy. On a good day we would set out 2 packs of posts first thing have a quick break then ram nearly all the posts in before we knocked off. Seen them hit with tractors run in to by horses at full speed and never moved them although i could pull them out if they where lifted vertically was how the soil held on to them
I agree with Doobins rates, it looks like a hand dig job too, the first post is way to close to the streetlight for my liking and it looks like you've got a BT manhole and maybe something else 3ft inside the fenceline. Either way, an Augar is a sure fire way to find cables and it really wraps them up when it does find them. I'd be tempted to get a fencing firm to price it for you and just put your 20% on top. Chances are they can do it cheaper than you can and they love hand digging as they have to do it every day.