This is Roper bringing you a complete 100% walkthrough of Hitman: Absolution. This video will get you the following challenges in level 9, Shaving Lenny:

Chameleon
Evidence Collector
Infiltrator
Suit Only 
Oil is Thicker Than Blood
Get the Mechanic 
Kill Me, I'm the Cook
Pump It Up
Shocking
Gotta Go
Well Done 
Shave and a Haircut
Accidents Happen
The Weakest Link
Safety Distance Part 1
Safety Distance Part 2
Safety Distance Part 3