Driver and passenger side axles? When I was changing my oil, I discovered that my driver side outer cv boot was damaged and there was grease everywhere.

I did a quick search, and the DIY forum has a couple of informative threads about changing out the boot or the whole axle. I was just curious that if I do decide to tackle this myself, should I bother getting both the passenger and driver side, or just tackle the damaged one (I'm thinking if this should be the same as buying only two tires and not just one).

Also, is this something that a novice wrenchhead should be tackling by himself, or would I be overwhelmed? I have basic handtools and I could get access to an air compressor with wrench, but is this something I should let a pro mechanic handle?

If so, I was just thinking of getting the parts at Kragen and just let a mechanic install them for me. Are these non OE parts good enough to use? Sorry if this seems like a lot of questions, never had this done before, and I would like to get this done right the first time.