Curious to know how it's done? 

See below.

There are many techniques and different equipment used in tree maintenance and removal.  Make sure to ask what equipment a company will be using before scheduling them to work in your yard. 

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Pruning & Tree Felling Techniques

◼ limb walking     ◼ sectioning limbs     ◼ zip lining

◼ rigging and lowering limbs with ropes

Techniques

◼ using rigging to lower limbs    

◼ sectioning (cutting a limb off one small section at a time)