Anytime is the perfect time. Any day, you can sit down and make a list of the things that you'd like to focus on, the things that you think would add light to your life, and you can begin that day to move into that new energy.
Just choose. Choose what you want, set your desire, make your intention, and then do it. Make it happen. Aim for the target with purpose. It will be easier and easier as you keep moving toward that target. If it's a long term goal, keep moving forward. If it's a little "clean house" goal, keep moving forward. No matter the target, keep moving forward.