With some studying, and playing at low limits in a casino or micro-limits online, you can start honing your skills right off, and move past the real donkeys in a short time.
There are many smart people picking up poker now, but there are also a lot of people who play without bothering to learn. I played at a local casino last night (my first time ever, after 2 months studying holdem) and I observed a lot of loose play, out-of-position play, and over-valuing of marginal hands like KT. At a table of ten , there were 3 good players. The rest of us were new, mediocre, or just plain bad. I am a complete newbie, and I was able to play 2 hours and break even, depite several rookie errors in my play, just from being a bit nervous my first time out.
I believe you do not have to be a genius to get started, just keep your regular job for security, and make sure you try to learn from every single session and every good player you face.
There is no way to tell ahead of time when you will get good enough to make a living off poker, if ever. But you will never improve at all if you don't take some chances and try. If you don't like that risk, then you should completely forget this whole idea and make money some more traditional way.