This is a decent 3 step instruction article outlining exactly how to retro fit your trike/bike with a Bafang mid drive motor. The Bafang is similar to my TSDZ2 except it utilises a cadence sensor as opposed to a torque sensor.

Here are the 3 links to each step of the instructions: Link 1 / Link 2 / Link 3

Below are the two videos from the article.