You can get a pretty good alignment at home, but you need to spend a few bucks at the home store and spend A LOT of time doing the actual alignment.
Shaun in here has done his own alignments, as I recall. Not long ago I posted a fairly long (albeit it very crude) post outlining the basic details.
If you want to get it done quick and be reasonabley sure it is right, Joe, et al, are correct. It can be tough to find a shop that will play nice with the CC plates though (call around a lot, IMHO). For instance, I dont know about you guys, but I wont let anyone drive my car period. If they insist on a test drive, I keep lookin.
And to answer your question, if you change the camber (you probably have a good bit of neg camber right now, which is why you want CC plates), when you dial that neg camber toward neutral, it will probably change the toe setting. I dont sweat camber dial-in too much (and caster - well you go for about all you can), but toe can be tedius to do yourself.
Good luck.
