Shouldn't take any longer than 30-60 mins with the rivet tool. Piece of cake with it. I didn't have the tool and ended up having broken ends fall into the body too. Annoying at first but don't even think about it now as it doesn't make any sounds or rattle.

Your dealers qoute for labour is daylight robbery. I think with each oem parts installation manual there is an estimated labour time set by BMW. I'm sure there is a detailed how to been posted a while back with estimated time.

Make sure you buy the correct rivet tool though, I went to every local store that sells rivet tools and no one had the correct one so I ended up letting the dealer do mine as they also did my aero kit for a reasonable price.

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2009 135i M Sport Convertible
2008 X5 3.0si
2003 E46 318Ti M Sport Compact - donated to parents
2003 116i Hatchback - donated to brother
2002 316Ti - Sold
2000 318ci M Sport - Sold
1998 318i Sedan - Sold