Brake job, DIY?

Fellow Benzheads,

I'm thinking about doing some brake work on my 560SEL this summer. It needs new pads all around and new front rotors. From what I understand (or have read here) it's a not advised to turn MB rotors, but I don't understand why?

Is this a relatively "easy" job to perform? I'll have the help of one my buddies, so collectively we have ramps, jacks stands, floor jacks and tons of tools. We did the brakes on my '70 Olds (front disc, rear drum), which didn’t take too long and was smooth going.

Thanks in advance for any advice or pointers!