I think you will do just fine. Mine were spaced 6 months apart, so a bit farther than yours. Frankly the only thing that I recall was the sleeping. I still wasn't sleeping well because of my first knee, then had the second one and it demanded I rest / nap. So the first knee enjoyed more rest!! I just rolled with what my body & knee needed sleep wise and we made it through.
I do know that the first knee wasn't overworked or anything having the second one done closely together. I imagine you will be napping and doing great in no time.