Hello Billy, welcome back! My advice to you is.... don't wait. I had 4 months between mine and I'm getting on just fine. Even though the left wasn't hurting as much, I figured out if they were prepared to do it, why wait? It won't get any better, we're not getting any younger (well, you may be but I'm certainly not) and waiting lists are certainly not going to get any shorter.
Good luck and let us know what they say at your appointment.