When I put dreadlocks in my hair, I used Knottyboy.com and their FAQ page for all the how-to questions I had.
I would suggest doing them yourself (with help from friends or family). I don't know anyone who's been to a salon to get them, but they are really easy to do (just time consuming) so I don't think it's worth it to pay someone (especially if they don't have experience with dreads...)
I agree with one of the other replies to this post that you should dye your hair first. Not only are dreads tricky to dye, the bleaching agent in the dye will dry out your hair, thus making it easier to dread.
Good luck!!
Lobes: 5/8" lobes x2; 2g x1 (2nd hole); 4g x1 (3rd hole). 10g septum. 8g tongue. 12g nipple. 16g eyebrow. 2.5 year old dreads. Sternum microdermal (rejected).
"Have nothing in your house, except what you know to be useful or believe to be beautiful." -William Morris