First decide if the commitment is just to yourself or if this commitment would include others.
Second acknowledge how important this commitment is in your "bigger picture" and how it will contribute to you moving forward and the others involved.
Third, if 1&2 have been meet have fun with the commitment. Life can be fun.
As you move through the experience. Periodically check within yourself to determine if any of the initial visions of the commitment have changed. If so, acknowledge and adjust or excuse yourself from the commitment. The greatest detriment to yourself and others in a commitment is not being truthful as things change.

Know that there will be someone or somethings that will come into your life which may lead you to disappointment. Or perhaps decisions you will make that will lead to the disappointments of others. Starting a commitment first with an understanding of yourself and the desired outcome will help you in establishing a foundation. This foundation can be changed and modified as needed. The key in all of this is you are able to clearly understand yourself so you can confidently express your ideas, thoughts and feels as they change. No one person is the same as we shift through life. The key is to honor, acknowledge and take new steps as your alignments become clear through the experience.