I recently passed the PMP exam. This certification is well known and recognized. It is equally difficult. My story attests that it is doable if you are willing to do the work. I published my notes here of my path to PMP success as a starting place to help others along the way. Please know there are many others besides my own, and many very capable and willing folks to help you. Feel free to contact me with questions. I organized my notes into these sections.