did you take lessons before you bought the car? what year is your car? do you know how many gears you have? i am not being funny or trying to make fun of you, but, unless you have an older challenger, you probably have at least a 6 speed, in which case, your shifter should be up to the left for 1st, then down, then up a little bit for 3rd, then down, then up a little more for 5th and then down for 6 and reverse should be all the way to the right and down. so, unless you are just throwing your arms around, you shouldn't be worried. but, if you did not take lessons to learn, sit in your car and learn where the gears are. and, just to answer your question, it does not lock you out of reverse. you shift into reverse at speed, you will destroy your transmission, at the very least, and crash badly, at the worst. don't drive your car until you learn the shift pattern. for your safety, and everybody else's
sorry, just realized i told you the wrong thing, it is over and up for reverse, not down, sorry about that. was thinking of my corvette