I second Mescalimick's vote. Unless you have a good jig, it can get messy. I had mine done by Bill Rynert from the NOC and it was a top-notch job.
I don't know if he is still doing them or not (it was a side job for him), but he's done thousands of them. All of my friends from down there have had one or more gaskets done by Bill and all were happy. Give a call to 828-488-2175, extension 150, and ask them if he's still in the business.
Just remember that if the next is too tight, don't coffee-can it, use pinking shears.