This is why painters say "make it yourself," it's not because we are trying to be jerks, it is because 1 you appreciate how much work is put into it and 2 you can only learn these tough skills by doing; trial and error.
As for your follow up question, one way is to find an image that matches the texture (such as bacon) and then arrange it on the base to match the real car. The hardest part is matching up the edges of the template, sometimes you gotta do some warping or filling to make it fit correctly. You also start to learn where the actual connections on the template are. A lot of times the outline is just an approximate to the actual merging point