Interesting video ... that's a lot of different reference points though.Try to find some reference point (a point on your car that aligns with the other cars around you) that you can repeat every time, like in the video linked below.
I have my own reference points but the ones below are a good start.
The way I learned it was to line up the front wheels of both cars to start (or the rear wheels if mine or the other car is very long) with the steering wheel straight, then start rolling backwards while also turning wheel to the right at same time. When my front wheels line up with the other car's rear wheels then I start turning steering wheel to the left while I keep moving. Modulate speed and turn rate as needed. Then straighten out once I'm in.
I don't use the drivers side mirror at all, mostly just look over my shoulder and at car in front.