Although it might seem like drudgery, you can complete any task if you work at it regularly, including projects you’ve been putting off.
A small daily task, if it be really daily, will beat the labours of a spasmodic Hercules. – Anthony Trollope
So, rather than claiming that you’ll devote an entire weekend to clearing out your garage, for example, try tackling one section at a time, for one hour each weekend. Decide what you want to keep in there and relocate the rest. Corral similar items (car maintenance, sports, yard tools) and store them off the floor.
Before you know it, you’ll have room to park your car. The process is the same for any area you want to clear.
If it’s a paperwork backlog you’ve been avoiding, not a room, the same philosophy rings true: Organizing, like brushing your teeth, is best practiced regularly.