I have an EQ5 and unless my polar alignment is pretty good the guiding can be a bit rough.
If you can't align the mount visually then you'll have to drift align, either with an illuminated reticule eyepiece or with your camera and software.
I prefer to align using my guide camera/scope and PHD using the method described at the bottom of this page:
http://www.njstargazer.org/PolarAlignment.asp