Pete Owens wrote:The things you need to be able to see to decide whether it is safe to open your door are visible in the mirror, but hidden behind the door pillar if you attempt to look directly.
In the absence of your recommended procedure but having read your posts should I read that as:
* Look in your mirror
* Don't look through the side window
* Use either hand to open the door
* Don't look through the aperture as the door opens?
Since the ONLY place you will see approaching cyclists from behind the car is in your mirror it is important that thoroughly checking the mirror is the thing you do immediately before you open the door. All else is distraction. The road environment is constantly changing so anything you do between checking your mirror and opening the door gives a chance for a door zone cyclist to appear - and if you are reaching, leaning, twisting, admiring the sunset o staring your door pillar or indeed anywhere other than your mirror you will not see them.
However, since you are absolutely hooked on a multi-stage process I would suggest this:
Works for any sequence where step n = opening the door and n >= 2
1. Whatever makes you happy
n-1: Check your Mirror
n: Open your door