How did you change the paint color on Jake's truck Charles?
Okay, you select a region with one of the selectors - the smart scissors, in this case
You select colors and click "desaturate" which takes all colors out
Then you hit colors again and hit the color board and slide stuff around till you like it. Write down the changes- for example, Hue 39, Saturation 67, Brightness 30 and do it for all body panels or the rest of whatever you are changing the color of.
To make the rims line up, resize them until they line up with the top and bottom of the rim you are replacing. Then, on the resizing page, press that little clip button so that you are only changing width and then you can make them thinner until they line up right.
A way to make things line up better is to copy a piece of the ground or the truck somewhere else and patch it into a spot you are working on. I used to do this for an online clothing business, clipping and editing photos, so I had to figure it all out by myself
If you got more questions, go on and ask.
The hardest part is figuring it out. Once you do it gets easier.