OK, Mark. I'll try to answer your questions:
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Did you have prior experience with paint before you tried it?
No, I'm not a painter, but the instructions the paint-guys at the shop gave me were enough. Thin layers, don't hurry and so on...
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What did you use to smooth it out after sanding, paint, etc.?
I guess the fender you got is painted already. To make the new paint stick, you have to rough the surface a bit. I'd recommend a 1500-2500 paper for this. Like I said, the first paint is a ground/bottom color and the you build the paint up with the second one. Quote:
Did the auto shop help you out with the details?
They sure did. I guess they deal with quite a lot of Do-It-Yourself-people.
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How much did the paint go for?
Well. That's the downside. The paint was quite expensive. If I remember correctly each can was about 50USD. You also need a good clearcoat for the final touch and protection. Quote:
Which paint did you need more of?
This one will be no problem for you. Remember I did two bags and I found out I needed another can of the second stuff to get the right shade/darkness.
Please bear with me and feel free to ask more questions. I'm not native in English... 
