I just changed the oil in my RTS last night for the first time. Frankly, after all the people on here who talk about how complicated it is, I was stunned by how easy it was compared to some of the things I've worked on over the years. Thoughts:
You need a total of 4 tools. A T30 driver for the body panels, a 36mm socket for the oil filter cap, and a T45 and 6mm hex for the drain plugs.
The body panels take all of maybe 5 minutes to remove, if you stop for a cold drink in the middle.
The drain plugs are both accessible without removing anything. The T45 one makes a mess as soon as you remove it, but its not too bad.
The oil filter sits in a cup on the side of the motor, and the cap comes off the cup. Far better design than my Mini Cooper, where the oil filter is in an upside down cup which screws into the side of the motor and dumps oil down the side of the motor as soon as you remove it.
The O rings are a pain, but if you've ever worked with o rings before it's no big deal. Cover the threads before you install the new o ring, oil it before you put it on, and you're fine.
Start to finish it couldn't have taken me more than 45 minutes to do, and a large part of that was the whole "warm it up, let it idle" business to check the oil level when done.
I'm going to have to look at these dimple drain plugs you guys talk about, but if the only reason to change is that they use the same tool on both to remove, I don't really care.