68 barracuda 383s "Driver Paint Resto"

Unless you have access to a booth and a quality paint gun, and have experience, I'd say your plan to find somebody else to spray the color and clear is a good idea.

With body work, prep is where the majority of the labor is. It's also crucial to getting a good finish. Luckily, it's amenable to trial and error. You can keep trying until you get it right, and the added cost is your time and some relatively inexpensive filler or primer. You can even do it in your driveway with a cheap harbor freight gun and a small compressor.

On the other hand, if you screw up the base/clear, you've wasted some serious money, and starting over is not attractive. You walk into the booth, and you've essentially got one chance to get it right.

If you can find someone who is willing to spray over your prep, and he will spend the time to inspect your work and tell you where it's lacking, I'd say that's the way to go. With guidance you might even pull off the color sanding and polishing, although the risk of burning through is substantial.