Ready for lifestyle change?

Those with no other children ttc first in advanced age, do you wonder if you are ready for lifestyle change? I am 39. Was single and living alone many years. Married a year ago and hard enough to deal with living with hubby. I like and need my sleep, all eight hours of it. I hate clutter, like to be alone a lot, watch TV, etc. I want a baby but wonder if I'm too set in my ways and if I will be a cranky mess. Only one worried about upheaval of a baby? I already told hubby that if I don't get pregnant by 40, not sure I will want to