Here's a series of guides that take an Ender 3 Pro and upgrade it with a Duet Maestro.
https://duet3d.dozuki.com/Guide/Ender+3+Pro+and+Duet+Maestro+Guide+Part+1:+Wiring/37
It won't be exactly the same, but it should be a useful outline on how an upgrade would be done. It goes through commissioning and testing as well as basic tuning.