Demoman is a pretty easy class. I tend to think of it as a beginner class. With the Grenade Launcher, you can, in fact, launch grenades. Try aiming where there are groups of peoples, for instance an Engie's nest or such for maximum damage/kill chance. As well as that, you can place Sticky Pipe Bombs with the 2nd Weapon (Stickybomb Launcher). Try to set up traps, so put an amount of stickybombs around a door, arch or somewhere where there is a lot of enemy traffic. Press M2 to charge the bombs, causing them to explode. Obviously, again, try to do it when there are a lot of people walking over your Stickybomb trap. If you get the Eyelander/Claidhaemh Mor/Skullcutter as a drop, they're the Demo's melee weapon (obviously) and have a humongous reach and strength. Good for things like.... Medieval Mode, or when you run out of ammo. If you really want to try Spy or Sniper, I'd suggest practising first on the brilliant 'tr_walkway_rc' map. Don't download tr_walkway_rc2, because that's broken.