You are going to have to determine “looking good”. Spray can factory matched paint will not match your existing paint exactly. Original has faded over the years. When you rattle can a large flat area is not easy to get an even coat laid down. Orange peel is common.
Do a good prep job. Watch your environment, dust is a killer. When you paint, many many thin coats are better and more uniform than a few heavy ones. (That first color coat should still see primer showing through.)
So instead of spending a ton of money, spend a ton of time (not a one weekend project) and they can come out very respectable.
Dad’s are very protective. It’s in our job description.