You don't need bins. Cardboard boxes are better. Or even paper grocery bags (what I use). You only need a bin for something you are saving long term and try to make that as little as possible!
One garbage can (and appropriate containers for recycling), one box/bag for donations, one for consignment (if you have it), one for freecycle (if you do that), one storage bin for things you want to keep. Just having everything set up nicely makes it that much easier! Then just go through it.
As they fill up, take them to where they belong. Any donation stuff that you can deliver, just pile in the back of the car (and then actually drive them there
). If there's too much, you can also try Vietnam Veterans of America or GoodWill for door to door pick up (in some areas). Check my blog, I have the links to both on the right side.
Basically, the big trick is to do things in small enough increments that you will actually *follow through* on it. If you (for example) go through everything and then have a pile to donate that's too big to fit in your car, you're more likely to put off donating it. When your car is filled, drive off and donate. When the garbage is filled, put the bag outside instead of leaving it in the basement. Etc.
I don't envy you
I theoretically know how to handle a big pile but in practice I get easily overwhelmed and just can't follow through. I try to keep things more manageable so I don't get intimidated by the job.
Oh, and music. Music is important
Something high energy and uplifting. Something you like