Start by making a list of all the organizing projects you want to complete. Do a walk-through of your home and write down ideas you might have or spaces you could improve.
Then, commit to doing SOMETHING once a day, or even once a week. For instance, if you want to organize your desk but the whole desk overwhelms you, then just commit to one drawer. One small step can motivate you to take many more steps.
Start small and allow yourself the chance to check off those small tasks on your to-do list. The feeling of being overwhelmed will start to fade once you do SOMETHING!