Realize that we all start out unable to drive. It's something you have to learn. Even if driving is not something that appears to come naturally, enough practice will remedy that situation.
The large parking lot idea is a good thing to get used to turning and getting the feel of the car. I wouldn't start out with parallel parking for instance.
I can't even get parallel parking right every time after more than 30 years driving. However, I have what is now a stupidly large car and the towns around me have very small parking spaces. But if I am in a place like LA or San Jose, even the worst drivers can parallel park there in most cases.
Practice makes perfect.
After you get the feel of simply turning, set up some cones in a space (but make it larger than real life) and practice that all too dreaded parallel park.
Eventually work the cones closer together until you can do it in a regular sized space. And before you take the test, put the cones closer together than normal and try to parallel park. Eventually you will get that and when it comes to the real parallel park test (
the part that makes most drivers fail in California - the toughest state as they claim), you will pass it with flying colors.
After you get the feeling of the car, you will find highway driving a breeze, but make sure you have the in town and parking parts mastered because that's where the test is most heavily weighted (people pull out of driveways, there are delivery trucks/school buses/business owners picking up and dropping off mdse, double parking b/c they think they won't get caught, pets, skateboarders, and many people not following the rules of the road).
I had kind of jerk of a tester and he had me navigate the whole test through narrow and poorly painted streets which happened to be the ones around the DMV.