I just read a column that suggested that it is difficult to get rid of things but easier to decide what to keep.
The advice was to empty one space at a time, and once empty, decide what to put back (only allowing what will reasonably fit to be put back). Focus on the stuff that is being kept while someone else focusses on removing the other stuff while you are distracted by your special stuff that you selected.
For me, garbage day has become a game. After all the junk is at the curb, I go back inside and find one more thing to put out, and then go do something else before I am tempted to bring it back in. When I return and the truck has come and gone, I feel great relief