Simple mod help

[Necromonger]

Hi guys, I've read a lot of posts about modding, I've heard it's kind of difficult but not impossible. My objective for now is to create a simple mod (just replace a multiplayer character with one another). So I downloaded QuickBMS, as a lot of people suggested, and I extracted some archives like MP.pc or Common.asr... Now we come to my problem. What do I have to do to replace for example, the german soldier multiplayer model for the main character Karl? I'm looking forward to your answers, meanwhile thanks for your time.
P.S. i've tried with renaming the folders inside MP.pc (I changed enemy_sniper to german_alternate and viceversa) but the only result I've got is to have no character at all when starting a game, I can't move and I can only shoot my invisible weaponry. I still think I can sove this if someone better than me helps out.

[dr. zberf]

Mods are ♥♥♥♥, It will ruin your game. Anyway there're 2 files for a skin. dff n txd.

Find the skin name over google/internet, And replace both of the files.

[Necromonger]

I think you are talking about modding GTA:SA, not Sniper Elite V2. They have a different engine and different model format type I suppose.

[Khesnar]

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[Necromonger]

?