What kind of qualities do you think make a good private pilot?
Patience. Everyone hits a "hump" in their training at some point. For me, it was landings. Be willing to just practice and get through it.
It also helps to have a level of "geekery" about aviation. And by that, I mean a willingness to fall into study of something, the way people do when they really love it, whether it's math, or metalworking, or sports, or whatever... we all know that type of person, who can't shut up about whatever thing they're into.
Even when you've got a PPL, there is more to learn. Always more to learn.
What do you like most about flying?
Gosh. Where to start. I'm a university professor, so I have the kind of job that I take home; my brain is still crunching on work-stuff even in the off-hours. But when I'm flying... all that stuff fades away. It's a time of focus. Of concentration. Of listening only to ATC, and to the instruments, and to the wind, and the view. Before I learned to fly, I sailed small boats in the lake where I went to grad school, and it was the same thing: relaxing and focusing at the same time. Magical. Primal.
I also love "the system." How we navigate. How ATC works. Airspaces. Geekery.
I think I have what it takes and I think my motivations are spot on but it's an expensive decision
Go for it! Don't think of it as a "decision". Think of it as a "journey" -- one that you can stop and start again as you choose, one that can take you to unexpected and amazing places. Shortly after getting my instrument rating, I embarked on a 1000-mile cross-country for 10 days in a 172. At the time, I thought it was the craziest trip ever. Years later, I took a Cessna 150 on a 10,000-mile trip that lasted two months. And years after that, a year-long 15,000-mile cross-country from Alaska down all around the Lower48 (
http://beetlejuiceadventure.wordpress.com). It was the kind of thing I never would have dreamt of at the beginning of the journey... Who knows -- maybe you'll discover gliders, or aerobatics, or flight instruction, or the cool restaurants at airports nearby? Only one way to find out...
All the best,