Jjoe, just fly your body down the extended centreline using either wing down or crabbed dependent on your preference or however you are taught. Rules of thumb are not really possible since drift, bank angle and rudder authority will depend on wind, airspeed and individual aircraft design. If you are looking at the runway out of a side window on a crabbed approach, or looking straight ahead with one wing scraping the tree tops on final then you can have some idea of the crosswind component and also expect an interesting arrival. An actual wind check from the ground would also be more than helpful of course.
If you carefully check the weather before flight and gradually build experience you will eventually figure out what you can and can't deal with and what might even require a diversion to an into wind runway.
We all get nasty frights from time to time. E.g in my case, a completely uneventful landing when it's blowing a hooley which you were well prepared and psyched up for, and virtual carnage because of a 6 knot crosswind which you considered irrelevant
