What really helped me get out the door in the morning, and still does, is actually to video myself doing it. When I got a Palm Zire 72, for the first time I could actually leave within a normal interval because I had a continuous, raw, time stamped record of everything I did from checking everything was off and secure to leaving the apartment and driving away. I refused to ditch the Zire until the iPhone 3GS because the 2G and 3G only did stills. To this day I still do it with my Pixel when I'm flying solo.
Which brings me to the other thing that helped: my very patient wife, who reminds me she saw me do it, you did it right, and get your butt in the car, darling.
The damnable thing about OCD is that a little is very valuable in my regular line of work (medicine). Without it I wouldn't be as careful, I don't think. It means it won't let me take shortcuts and it forces me to be thorough, and that's a very good thing in that business.