Start downsizing, within your home, as soon as your can.
I am watching what my boss is going through right now, his wife passed on a few weeks ago [14 yrs Alzheimer's] and he had to sell his beautiful home and find an apartment/condo rental to move into.... it has been a mad scramble because he sold his home within a week.
If only he would have started downsizing last year knowing that this would eventually happen. He's overwhelmed and said he's on a verge of a nervous breakdown. Way too much paper work to sort through on such a tight squeeze, so those boxes will find their way to his business office.
Everything that was once part of his life most will need to be sold or donated or tossed out. To wipe that much history out in just a few weeks is too much. If done slowly it is easier to deal with.
Glad I started shredding my own paperwork at my house. Like why on earth do I need Federal income tax forms going back 30 years? Keep 7 years and let the rest go. I have old stamp books and old coin books that I will send to my sig other's two grandchildren for them to take up a new hobby.