The first few weeks and months will be a rollercoaster. Nothing ever happens in a straight upward line. There will be bad days, sometimes several bad days. Then it will improve for several days, only to backtrack again. Try not to get discouraged. Over time it will slowly become easier and less stressful.
Be mindful of how your partner is doing. Let them have extended time away if it will help.
Never be afraid to ask for help from family (if they can be helpful). One of our biggest regrets was waiting an extra week before asking for help from my in-laws. Best decision we made was to ask for help.