Need tips to remove fan screw from 4870

[familywang]

Okay, I need to replace the stock fan from my XFX 4870, the stock cooler is not a a reference design http://www.newegg.com/Product/Product.aspx?Item=N82E16814150436&cm_re=4870-_-14-150-436-_-Product
anyway, the screw on the back is extremely small, and they are extremely tight as well, so before I try to do something more bizarre, anyone have tips to video guide that tell me how to remove them?
sorry for my english, it's not my native language.

 

[familywang]

Okay, I need to replace the stock fan from my XFX 4870, the stock cooler is not a a reference design http://www.newegg.com/Product/Product.aspx?Item=N82E16814150436&cm_re=4870-_-14-150-436-_-Product
anyway, the screw on the back is extremely small, and they are extremely tight as well, so before I try to do something more bizarre, anyone have tips to video guide that tell me how to remove them?
sorry for my english, it's not my native language.

nevermind, finding the right screw driver solved the problem D