Black ops perk questions.?

Warlord can be kind of hard because of the multi kills. Sleight of hand can be a challenge because of the fast kills after reloading. Light weight you have to get the first bloods and play CTF so if you don't play CTF you're screwed. In a way all of them are hard in their own way due to the specifications needed for the perk. There is no "hardest" perk to get because it mainly depends on your play style. A guy that likes to snipe will get scout alot easier than me because I like to rush but on the other hand I'll most likely get sleight of hand faster than him.