Excellent!! I'm working on the RHCE right now. I started on an mcse, took courses 290 & 291, but decided a point and click career wasn't for me. At the same time, i was being exposed to linux at work & thought it was much more simulating than windoze. For me, the best way to learn to administer linux is in tandem with setting up some service, like sendmail, and since during so there would something related to the curriculum, like iptables; just being practical to my needs, then later i'll just fill in my missing knowledge.
Good luck in your studies!