The M logos will come off easily on the brake and clutch pedals. I've had this problem before. I just stuck it on with some really strong epoxy glue, clamped it, then left it overnight to dry. Worked out great.
Your right the accel pedal is difficult to do. However, to make it easier there is a "C" clip that holds the accel pedal in place. You can remove the "C" clip and simply take out the entire pedal to make for easy install.
Brake pedal is metal, clutch pedal is plastic and accel pedal is plastic. It wasn't difficult to drill the holes, any drill bit will do.
'02 C32 AMG / '07 C280 / '07 CLS550 / '15 JKU Rubicon