1. Aim. Think that someone is camping (crouching in a spot) in a corner. Imagine. If you are encounting an enemy, Go for the head because it's vulnerable than the other body parts. If they crouch, just lower the gun for their head.
2. Sneaking. When you are running, your footsteps can be heard and other players would know that you are running against them. Try sneak very often, if it is 1 player versus another.
3. Teamwork. Sometimes when you have a feeling when you are going to get killed being a rogue, following your teammates if a good way. But it's cowardly to follow your teammates.
4. Rogue. If you want to film your skills, don't follow teammates. Go alone. Follow all steps but "Teamwork".
5. Screenshots: Your friends think you suck. Surprise them. Taking screenshots at your stats usually proves alot. But if you really suck and you can't take it, just edit the picture in Paint, by inserting ping, editing names and other stuff.