The way Michael talks, you'd think he was trying to talk you out of getting into photography. Either that or yanking your chain... 
But seriously, while everything Mr. Kellough says is true, it isn't going to all hit you at once, the way his post did. A pro's going to have to worry about all those things, you'll have to worry about some of them.
BTW, it's possible to try before you buy. Both camera bodies and lenses can be rented, in fact all the gear can be. It might be tough to do this outside of a major-major city (LA, Bay Area, New York), but there are several on-line rental outfits that will deal with non-pros. Lens Rentals is a Memphis-based outfit whose website I really like. I haven't dealt with them, but I intend to. Before I put out 800-1000 USD for that lens, spending 59 USD (shipping both ways included) to try it for a week seems to me to make real sense.
I'm not sure that there are any overwhelming reasons to prefer Canon over Nikon or the other way round. Both make excellent stuff, both make...that other kind of stuff, too. Unless you're after one very specific purpose, it's unlikely that there's a clear winner between the two. I bought into Canon based on the availability of excellent third-party camera control software (dSLR Pro from Breeze Systems), but I don't know what's available for the Nikon or others. As I said in an earlier post, I don't know, but I'm quite sure mine's better. ;D ;D ;D ;D
Ned

But seriously, while everything Mr. Kellough says is true, it isn't going to all hit you at once, the way his post did. A pro's going to have to worry about all those things, you'll have to worry about some of them.
BTW, it's possible to try before you buy. Both camera bodies and lenses can be rented, in fact all the gear can be. It might be tough to do this outside of a major-major city (LA, Bay Area, New York), but there are several on-line rental outfits that will deal with non-pros. Lens Rentals is a Memphis-based outfit whose website I really like. I haven't dealt with them, but I intend to. Before I put out 800-1000 USD for that lens, spending 59 USD (shipping both ways included) to try it for a week seems to me to make real sense.
I'm not sure that there are any overwhelming reasons to prefer Canon over Nikon or the other way round. Both make excellent stuff, both make...that other kind of stuff, too. Unless you're after one very specific purpose, it's unlikely that there's a clear winner between the two. I bought into Canon based on the availability of excellent third-party camera control software (dSLR Pro from Breeze Systems), but I don't know what's available for the Nikon or others. As I said in an earlier post, I don't know, but I'm quite sure mine's better. ;D ;D ;D ;D
Ned