This card is pretty easy to install (except the parts are very small, need stable hand), simply use your common sense, only connect the cable to the port that fitted. Nothing should go too wrong.
From memory, no one reported any "wrong connection" on this upgrade yet. But someone may over tighten the card, which actually make the card bended a little bit, and "create" a poor contact. If the card is not detected, then you may try to adjust the screw tightness a bit.