Just make sure to use the selective Gaussian blur (if Photoshop has it–I’m using GIMP) and not a regular Gaussian blur, which will produce an overall blurring effect rather than leaving edges intact. It’s a nice tool to reduce noise, though it can take awhile to crunch the numbers and spit out the results on a large photo. I used a blur radius of 3 and a max delta of 45, but those numbers can be adjusted to suit your taste in the final result. You can also just run the picture through Noise Ninja or Neat Image after you get it lightened to where you need it. Good luck with it!