I did this on my '06 after returning from Key West, and noticing that the luggage I had strapped to the passenger seat, and the luggage rack had screwed up the cheap factory ones. I had a heck of a time drilling out the old hinges because I was using some old drill bits I had laying around for years, instead of stopping and going to buy some new ones (even though I thought about it several times....I'm stubborn like that) KEY: have a couple new "metal cutting" dill bits handy.
I also did this by myself and it was tricky holding the tour pack lid in a position that made it manageable and secure while drilling out the old hinges, then even trickier holding it in place to line up the existing holes with the new hinges, while also trying to put the screw into the hole. But it was'nt too difficult, just tricky. Altogether took me about 2 hours.
I was so pleased with the look of the new hinges, and the way they worked. I am waiting to find my next block of time to do the replacement on my '09, just because the replacements are so much better. You might want to replace the factory lid cable with some jack chain as TQuentin has suggested also.