Dani Rae,
I am post op and I look at stopping HRT for a month as just one more thing to do to keep me safe for surgery.
Yes, there is significant mental relief in HRT and stopping for one month might just cause some emotional issues, but these are relatively short and when you are post op you can look back on that month without HRT as a minor bump in the transition process.
For my self, the moment I woke from genital surgery, my dysphoria was completely gone and never returned. Given the choice of continuous HRT or genital surgery, I would have the surgery without a second thought. However, the vast majority of us go right back on HRT once we are post op.
Best wishes and good luck with your surgery.