coder.
Handling can be learned by someone who doesn't thoroughly understand the code, you just have to find the right values and learn how they change how the car behaves. It just takes a lot of trial and error. (It's an excellent idea to change the values with console in singleplayer, then save the ones that work best)
As far as setting up the bones, exporting it correctly, and otherwise getting it in-game, you definitely need the help of someone familiar with vehicles.
The one thing I recommend is that you make more accurate wheels and suspension. You don't need to try to be completely true to the real thing, but there are some basic differences that disturb me:
The suspension connects in two V shapes higher and lower on the wheel, not a single centered one
the spokes of the wheels do not become thicker as they go outward, and the tires have white or yellow lettering and line on the side
