That is what I'm doing right now... I got my pistol, read the forum and PT.com, and go practice. But I know I have a lot to learn, and if I see a class in my area, I'll take it if the cash is there.
I used to shoot competitive smallbore in high school. Now, how hard is that? Shoot through peep sights designed for the target, sitting, prone, kneeling, standing. No recoil to deal with. Sling.
Even after two years of shooting weekly, I learned something every week. And before I even started, I had hundreds of hours in the backyard shooting air rifles.
I can shoot fairly accurately. I can shoot fairly fast. I need practice and training on putting the two together, and I need training based on real-life situations. Shooting is one thing, killing in defense with a pistol is another.
Learning never ends.