It needs specialised equipment (though luckily these days you can get started much cheaper than you used to) but also a good deal of practice to develop the necessary skills.

Yes, very definitely: Don't run before you can walk. Also, since you're building a car, you can probably get an accurate colour for the body by using a rattle can sold for touching up real cars. This also goes for the more generic colours you might paint aircraft in, like grey, white, etc., but not really for military vehicles (unless you find one that was painted glossy  )