The hoe should have the same controls as your small hoe, check to make sure.
3 days to dig out w/ a small excavator ,must be REAL small.
I dig out lots of stumps and my 710 is larger than most TLB but I dig out 40" beech and anything else in about 20 minutes.
I bid on a job to remove over 100 stumps up to 2' dia.,i figured less than 1 day and haul them off for $600.
The guy found a person to do it for $400 w/ a 350 Deere dozer and old Ford hoe still a days work.
But this guy didn't haul the stumps off.
2 weeks later he called about hauling them and we said $200 but he had to pay the builder to use his track hoe to load them ($150).
Talk to the rental place and if they are slow most will rent for machine hour, guys I work w/ that want to play do this, one guy had it for a week but only used it for 12 hours so he paid for 1 1/2 days and worked at his pace.
Maybe they will let u try it to see how u can do and if it doesn't work out pay for an hour or so.
Even w/ a LB75 about 3 digs on each side of a 12" stump and it will come right out and take maybe 5 minutes.