This is what I do to declutter, everyday. It doesn't matter HOW bad it is...
I start with: a laundry basket, a box, a trash bag and (4) 'grocery store' type plastic bags. The laundry basket is for dirty laundry (obviously, LOL). The box is for anything that needs to go to the kitchen (dirty dishes, cups etc.) The trash bag is for garbage and the 4 other bags are for each bedroom in the house.
I start in the master bedroom and work from room to room gathering things. Trash first, from waste baskets to gum wrappers...then laundry...into the basket. Then anything that needs to go in the kitchen box..in it goes. Lastly, anything that needs to go in one of the bedrooms goes in the appropriate bag. If there is anything that is in the wrong room, but doesn't have a box or bag to go in (like a book in my sons room that belongs in the family room), it goes outside the bedroom door on the floor.
After I have done a 'quick sweep' gathering of all of the rooms, each container goes (just inside the doorway) of the room it belongs in. I then go back to all of the doorways of the rooms to gather the other items and place them in the appropriate rooms (just inside the doorway).
Now, I can go from room to room doing what needs done without running all over the house and backtracking.
I start with the laundry room to get a load started. Then onto bedrooms... start by putting away items in the bag, make the bed, dust, vacuum...move on to next room. After the bedrooms are done, I do the bathrooms, the family rooms, dining room, living room...last is the kitchen.
Boy, this was harder to type than actually do. It seems more complicated, when I explain it, than it really is.
Oops, forgot to add that I take a pad of paper and pen with me on the 'quick sweep' to jot down things I want to remember to get back to later, things I need to buy, etc....After I have done the basics, I can deal with the stuff on the list. BTW...the TV stays OFF during this process. But, I admit, I usually talk to my best friend on the phone the whole time.... until I need to start vaccuuming....
Good Luck.