frustration

I bought several video games yesterday and have spent most of my off-time today playing them. I've been shooting pimps, gang members and corrupt police officers all day in various editions of "Grand Theft Auto". Right now I'm stuck on two different missions in GTA III, one where I'm supposed to hunt down a pimp and kill him and the other where I'm setting up a car bombing. I can't seem to complete either one, consistently getting killed by the pimp or running out of time for the car bomb. Grrrr.