I just changed the oil in my Passion. It's not so simple as many have claimed. The most difficult part was getting the drain plug off. It took me over 10 minutes to break the plug loose. What made it difficult was the height of the car, which made it hard to get a good leverage on the wrench. I used a wrench that's about 15 inches long.
As careful as I was not to get burned by the tail pipe, I ended up with 5 burns anyway. Wear long sleeves ;-)
I'm not saying it can't be done, but it's not as simple as some may lead you to believe, especially if you've never changed your own oil before.
I only decide to change the oil myself because the nearest smart center is 60 miles away, and I didn't really have the patience to wait for the service, plus I got a Mobile 1 oil change for $30.00.