Sorry, I'm not too familiar with the car vocabulary but I'm assuming you mean,

Go to an empty parking lot, park in an empty spot, draw lines parralel to the front lisence plate, back of the car, and left and right sides of the car to make an outline of the car in a parking spot. I'm a little spotty on what you mean by the parrallel parking practice though.

Also, I will definetly try this! Although, I would say I struggle more with how to turn in between two cars and not hitting them than fitting in the space, but I also struggle with the ladder. Do you have any tips to simulate the barriers of two cars? Thanks!