Need advice. The day is coming.

I’m one week out from the at home euthanasia. Please give me advice. How do I get through the next week? What is it like when they come? When they take him away and I’m left with my other two dogs, what do I do the rest of the day? What can I do to take care of everyone and myself in the days after? How do I contextualize this so it’s not so terrible? Any advice would be so helpful.