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If you have a FireRed rom, and an emulator, all you have to do is place the .ips file (In this case, the one you'll download from the first post), place it into the same folder as the FireRed rom file, rename the ips to match the rom, then open up the rom with your emulator of choice.
At least...
I hope you don't mind, but I couldn't resist writing a little piece on this for the gaming site I'm part of.
(I can't post the link here, <15 posts, but if you have a search for MOREtotheGAME you'll be able to find us :))
Keep up the excellent work!