That's good advice on how to learn painting! Experience is the best way to learn, I had my share of runs, wrinkling, etc. when I first started to paint stuff. I started with rattle cans, and got a fairly good job, but it wasn't gas-resistant, and that's what led me to try a paint gun and compressor. Now, the Harbor Freight mini-detail guns work very well, and I used it with their $99 8 gallon compressor. I also used a regulator on the bottom of the gun, and the desiccant filter also. They have a decent filter/dryer too, for about $30 that you hook up off of your compressor, and it takes the moisture and oil out of your air supply.
Once you have this set up, your painting can turn out really nice with some practice. The mini detail guns work very well, and can be re-used many times if you clean them well, with a lacquer thinner. I get mine from the Sherwin-Williams auto paint store, and it is cheapest if you buy the 5 gal can. I have their 22 gal upright compressor now, and it works well enough to power a little larger HVLP gun, those take a lot of volume, so your compressor need a lot of air flow. But, those mini detail guns work the best for painting small items like tanks and side covers. If you're painting a car, now that's a different story, and you need a large compressor with a lot of volume for the regular size HVLP guns.
But, your best painting comes from the best preparation! Make sure that you sand out any defects in your primer coat, and wait for it to cure per the manufacturer's instructions! Also, between coats of paint, also follow the directions from your paint supplier for wait times and mixing your paint, reducer, and hardener.It does take a lot of time to produce a quality paint job. Good luck, I have confidence in your being able to do it.
Charlie