Just the general Haswell guides should more or less work. 3.9 Ghz isn't exactly stretching it, I think that is the boost frequency to start with. You should easily get 4.3 or 4.4 Ghz out of it. Do you have adequate cooling?
Not to argue with Intel God, but Vin seems a bit high. I think I am running 4.3 Ghz with 1.9 Vin. But his guide is quick and dirty.
For you Vin probably 1.8 or 1.9, vcore 1.1 - 1.2 to hit 3.9 or 4.0 Ghz.
small edit, was remembering the wrong cpu.
Thx for the quick reply! New to overclocking I guess the settings will look something like this then?
CPU Cache multiplier 35
Fixed CPU VCore 1.25V-1.30V
CPU Cache Voltage 1.20V -1.25V