I havent found a way to put some C4 on myself.I have the demo, and on the multiplay there's only one map. Most of the players aren't that good, so we have time to make up those kind of schemes and plans, while the vehicles are backing off the enemy. I've played this map so many times I know it by heart, and I rule at it. There are little outposts and the engineer hides in there.
It's very easy if everyone knows the drill, and I play with friends that know the play perfectly. Now I have no trouble getting a pat on the back and running into oncoming traffic.