How can I put slight of hand pro to use in MW2/Black Ops?

Ok I know that not many people play MW2 anymore. I know there is just noob tubers, boosters and annoying quick skopers in it. But they are the reason on why I want to crush them. I have watched a man named "The Sandy Ravage" play MW2 with the ump45 silenced with slight of hand pro and he uses it when his reflexes are at his peek. I mean he is beast. I get my moments of good game plays and am almost first place every time in my lobby. But one of Sandy's vids called "Best of the rest MW2 destruction" he goes on monster mode. I don't know how he does it. He knows the spawns and everything but when I try to get everyone I just get shot. I do not like to give up in my game play, I put effort into my game plays. I play to win and get my kills/kill streaks. I have played with scavenger and it's ok, what I don't like about it is that you can't play aggressive with it too much(but in Black Ops you can have slight of hand and scavenger). When I try I fail. I like Scavenger with the Scar-H and get a decent 40-50 kills but that's defensive, I want to be more aggressive. I mean I am aggressive but I want to be SUPER AGGRESSIVE and not die, hard but possible. But I want to know is there any tips on using slight of hand? I want to live stream on Justin tv. I have played black ops and am quite a beast at that too. The slight of hand in Black Ops is good. I want to crush everyone in MW2 first then when I get Black Ops(Don't have it yet, played at friends house) crush them as well. Also if anyone can give me tips on spawning, like how would I know when to check my back. I try and I can't seem to get anyone to pop up when I want them too??? This is in FFA I know the spawuns in TDM or Domination. I hate the spawns in FFA cuz I die like right when I spawn. I want to become a pro and win my matches. I mean I win my matches but die too often in FFA. I die like 10 times. I can't get nukes and want to get at least one in FFA. I am good with the Famas(MW2 and black ops), Ump, Scar-H, AK-47( I find the 74-U too easy to get kills with especially with rapid fire). I know this is a lot to ask but why don't I get one trigger kills with Famas in MW2 with stopping power when I aim in the chest. I think that should be instant death( I say this because Sandy does in most of his vids). I want to know one more thing. How do people get so bored of Black Ops and MW2 so fast??? I mean it's like two days and their bored. I don't get to play whenever I want which my friends says that's why I'm not bored yet but come on. I think the Cod games are pretty awesome and deserve #1 on gaming records of our generation. Thanks. Peace.