Step 1: Buy an EXPENSIVE knife skin. (Karambit Fade, M9 Bayonet Case Hardened, Huntsman Knife Slaughter)

Step 2: At the start of warmup, demand knifing.

Step 3: Right Click once, left click twice.

Step 4: Strafe quickly to dodge bullets.

Step 5: Once you get a knife kill, buy a mac-10

Step 6: type this in console: bind uparrow "buy mac-10"