Hi Anthony,
I agree with the overall sentiment you are receiving here from the other members... don't fret about the weathering too much. For me, it was the most fun. The goal for SWAT is to replicate your specific trooper as closely as you can by referencing screen shots, and if appropriate, other SWAT builds. You should try to reproduce the texture, pattern, and color of the weathering as best as you can, and then be open to suggestions.
Although it might seem like we are asking you for "absolute perfection", there is plenty of room for personal interpretation. For example, although most use acrylic paints to weather, I was able to accomplish it with colored tile grout (and a touch of Tunisian sand). Ultimately, our goal is not to tear you apart, but to help and support you in your build.
Enjoy the process... we're here to help!