haha i started with mine on a 9 and it went fine. in the instructions that come with it..it says "start with 3 and work your way up" 1 to 3 is mild, 4 to 6 is medium, and 7 to 9 is aggressive.
Thanks Turtle. Had no idea Lord L6 is that aggressive. Maybe that's why I get more irritation when shaving with Slim - I set it too mild.