If you have little to no knowledge about electronics, get a professional to do it. Ask around in your local community, there's bound to be someone who knows how to do it.

I've soldered stuff myself, and I have above average knowledge about that stuff, but my hands aren't steady enough to solder small stuff like a PS2 modchip. I had a pro do it, because he could guarantee it would work. If not, he would get me another PS2 free of charge.