Flip a coin, write things on note cards and draw randomly, ask someone which one to to, or any other method of making a choice. The hard part is making that decision and not letting yourself get stuck thinking about what you could have done instead.

Although I have had solid success in using mindful meditation to work on making decisions and sticking to them, it gets really hard when things are stressful and this weekend wasted half a day with decision paralysis despite taking meds and starting the decision making progress. It won't always be successful, but it sure helps to work on making decisions and sticking with them.