Good advice
"My guess is that you would be better off going to one of the high volume low cost paint shops, Earl Schieb, Macco, One Day, to name a few."
With that being said please do yourself a favor and leave the roller for doing house paint. I have been a restorer for over 40 years, sure to do a perfect job you will most likely need the right equipment, such as a quality gun for both primer and paint, the right body work tools, a good compressor with water removal system/filters, a dedicated paint booth, various grades of sand paper from 220 to 2000 and a good grade of automotive paint, but with a lot of work and research you can do a good paint job with not too much money, will you win at a show for the quality of the paint job, maybe not, but will it look good, yes, if you put effort into learning and doing it. Even professional shops have to work at it and sometimes do it over. The preparation is the most important part as well as where you are spraying, the temp/ humidity and how you work the gun. Basecoat/ clearcoat will give you some room to correct errors, but single phase paint is doable also. Check out all that is available on youtube, or find someone who paints vehicles for a living and ask if they will paint yours on the side, locally there is a guy who paints Volvo/White trucks who does side work, I am sure it is that way all over. As to the cost of paint, yes it can be expensive. I found a guy who runs a paint business up in NY that blows the local suppliers away on prices for PPG. here is a link to one of his adds on ebay. I have been buying paint from Bill for over 5 years, he will also quote you a price on a custom mix. I have never asked him about a Model A color, but I am sure if you had the PPG paint code he could mix it.
http://www.ebay.com/itm/PPG-Omni-AU...1513511958&pt=Motors_Automotive_Tools&vxp=mtr
hope this helps, your mileage may vary