Seriously, you have to learn your own car. I see this with people all the time and it drives me batshit crazy, how can people not learn the size of their own damn car?
You take your car to an area where you can get in and out of it frequently without distubing traffic. Empty parking lots are good for this. Go to the edge of the pavement, whether it’s a curb or grass, and get out to see how close you are compared to how close you thought you were when you stopped. You can practice paralell parking this way. You can even take some folding chairs with you to use as if they were the bumpers on other parallel cars and practice that way.
You have to figure out what parts of your car you can see from your driver’s seat, which you can use as reference points for how close to things you are.
For instance, on my Mustang, I could use the passenger’s side windshield wiper hinge as a reference for whether I was too close to parallel parked cars along a city street. I used the ridges on the hood to tell how close I was to the left curb when parallel parking. I knew to cut into parallel spaces when my passenger’s mirror was even with the other car’s rear bumper.
Get someone to help you. Take a few minutes in a parking lot that’s full and go in and out of spaces to see how close you really are to the other cars. Have the other person go out there and indicate to you how close you are to the car in front of you, on your right, left, rear. Or do it yourself and get out of the car periodically to see where you are. Learn reference points around your car that you can use from the driver’s seat to tell how close you are to things.
It’s really the only way to gain confidence in your driving, and to help yourself from not looking like a total idiot when you have to pass a double parked car, and there’s plenty of room to do it, but you never learned how much space your car takes up, so you sit there like a dummy honking at the double-parked empty car, while people behind you are honking at you and yelling that “YOU HAVE PLENTY OF ROOM!!! GET MOVING OR GET YOUR ASS OUT OF THE WAY!!!”
Living on a one-way street with congested parking, I see this all the time. If I happen to be walking by at the right time, AND feeling charitable (not very often), I’ll even go out in the street in front of the offending vehicle and indicate to the driver how much space they have on each side. It’s usualy at LEAST a foot, sometimes as much as THREE FEET. I think they end up feeling pretty dumb once they get through unscathed and with the help of this grumpy woman.
So, please do your fellow road warriors a favor and try these exercises, learn your vehicle, and save yourself some face.
Your instructor couldn’t possibly have given the information he gave you about any other car except his. All makes and models are different. He expected you to extrapolate his information and apply it appropirately to your own. And you have to do the same for every vehicle you drive. And what works for a tall driver won’t work for a short driver, and so on.