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bought one (ideally second hand), used it, and then sold it on
This is what I did. Have run out of stuff to destroy now and need to start putting things back.
Was the stump grinder a massive thing? I have no access to my garden other than through the house and I'm pretty sure there's one lurking where my shed base needs to go. Might be very old so I'm hoping it's nice and rotted.
Polygon-
Was the stump grinder a massive thing?
This is the one I was going to rent:-
https://www.hss.com/hire/p/portable-stump-chipper
With two people you'd easily be able to carry it through a house.
Depends on the size of the stump though. That one does 25cm above ground and 23cm below ground. (The diameter of the stump isn't particular relevant, it just takes longer to work through it all.) A bigger stump chipper is going to be bigger and heavier...
Greenbank
A shredder would have helped hugely with my garden clearance a few years ago. I probably ended up filling 30 garden waste sacks (our binmen would take 3 per week max) and about another 200 bags worth in a number of trips to the tip in the car.
I think I got rid of 20ft of ivy from a fence and 7 or 8 trees, the highest of which was a 20ft fir.
I didn't need to buy one to keep, and renting one was going to be more expensive as I'd need it for many weekends. The closest I came was a friend of a friend who said he could loan me one but never seemed to be available for me to collect it. If I had known he was going to be so flakey I would have bought one (ideally second hand), used it, and then sold it on again. I'd have still needed to do some trips to the tip as some of the trunks were getting on for 12" diameter.
Once that was all done it was a case of paying £150 for Stumpbusters to come and do their thing (~20 stumps of various sizes). It wasn't much difference to the price of renting one from HSS and I'd have probably ended up removing one or both of my feet with it if I tried to do it myself. It was also a bit cheaper as they were already coming out to do a huge stump (40" diameter) in the bit of the garden belonging to the downstairs flat.
Something amazingly satisfying about garden clearances, it's just a shame it all grows back (and unruly) so quickly if you don't keep on top of it.