I change my oil every 5k-6k miles or so because of how hard I drive it. The first time around I changed it myself, which cost about $75 and took me an hour and a half because I was figuring a lot of stuff out (like how to jack a car up on all four corners correctly).
After that I decided to take it to my local mechanic. They charge $100 (less if I bring in my own oil), and they are just much more efficient than I am. The extra $25 is worth it, in my opinion.
But I do highly suggest you do it yourself at least the first time around. It'll help you get to know your car more intimately
