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Stump grinding/removal for a number of stumps

I have a number of cabbage tree stumps I need removed/grinded down to at least 600mm below ground level in preparation for a new retaining wall and fence. Access to the property is tricky, with sloped entry points to the section. Open to ideas/suggestions as to how best carry out this work. Biggest stump is 70x40cm and other stumps are approx 40x30cm