1. Set a date and put it on your calendar. 4 hours is a good timeframe to allow. If you feel you can't come up with one 4 hour slot of time, schedule 2 sessions for yourself of 2 hours each.
2. Gather supplies. Be sure you have a full-length mirror for try ons. Assemble 4 boxes, clearly marked DONATE, KEEP, TAILOR AND DITCH. Every piece you remove from the closet can go in one of these boxes.
3. Once getting everything out of the closet, decide the best way to put back those items you want to keep. I like putting all the slacks together, long sleeve blouses, short sleeve blouses, etc. I also do them by color order. Will that work for you, or do you prefer putting it back by outfits all assembled since you are always running late in the morning?
4. Be sure to take care of the other boxes ASAP. Schedule a time to get those alterations taken in, the donation box off to your favorite charity or shelter, and make your ditch into rags if the fabric would work for that. Be sure to cut in half so you remember these are RAGS and not to be put back in the closet once washed.
Remember you are bringing calm to your life as you purge and helping someone else with those items going off to a charity. Isn't that enough reason to get this going this weekend?