There's never a right time

It's too hot, it's too windy! Or my boss is not in right mood. These are all common excuses I come up with for not doing something. I wish to change but translating to action is a bit weak. I'm sure I have company from many people.
Yesterday was Mahatma Gandhi's birthday. One of key message of his was "Be the change you wish the world would have!".
Got me thinking about the multiple excuses I have for not making that last effort.
Change is not easy. The older we get the more ingrained our assumptions are. Our assumptions are based on our reality. Being an agent of change is hard work. Gandhi saw non violence as a means to win a battle of minds and wits. He was successful in so many ways!
How can we implement some basic philosophies of change? A small commercial phrase "Just do it!".