First There’s the Bit by Bit weight loss style approach, a clutter diet per se where you simply schedule time each day or each week to attack one or two areas at a time.
This is a great option for very busy people or for elderly folk.  It’s also good if you’re
going it alone with this task and are up against it with other members of the household. If it’s your other half who is the clutterer and you’ve finally had enough, you want action but any co-operation is about as possible as purple pigs flying at sunset. You probably dream of having the roof and walls lifted and a backhoe shovel teh contents into a dump truck in one almighty clean out so you can start afresh, dang! can’t happen due to the massive resistance you’ll encounter from the clutterer. The downside to this method is, it takes a little while to see results, and so it can be a tad frustrating, but slow and steady still gets the job done.

The second option is to have that great almightly week-end clean out - believe me I love this method, I’m a train smash kinda girl and seeing big results fast is fabulous like you see on TV however the caveat here is it does require lots of planning & cooperation and the biggest neh of all is the one hit wallop isn’t the whole solution to you problem and I can almost guarantee that you won’t get it all done in one weekend. There are always boxes of items that must be dealt with slowly and carefully and so these must be left for a later time. Nevertheless good planning and preparation  make it worth the effort.

Your 3rd option is the easiest of the lot yet to date curiously no one has ever chosen it. Here’s what you do; Go for a day out with the entire family just taking your important valuables with you Leave your house completely unlocked and open, and pop a sign out the front reading "all contents free, please help yourself,  don’t damage the walls,  we’ll be back at 5". I’m not 100% sure but I reckon that should clear your clutter well & truly.