2nd child at 40 yrs

I’m 40, I had my first child at 38. We had some fertility issues but we had a successful FET which gave us our daughter. Im pursuing another FET in the next coming months and I’m getting a little overwhelmed thinking how am I going to keep up with 2 children!? I mean I’m tired now lol, never mind another kid. I work during the day from home and my husband is planning to go to 2nd shift so he can help during the day but I’ll have the two kids in the evenings. I know it will be alot on our plate, Just looking for some advice and hope from other moms In their 40s that it will be ok 😔