Managing an implementation projects is so hard if you don't have enough experience.
To managing Dynamics CRM projects successfully you must take care of proejct management and the methodologies more than the other part. Becasue leading project would be different if the methodolgy is differenet.
I recomed to impelement Dynamics CRM throud sure step methodology but it is not suitable for all business.
If you like we could have an online meeting to evaluate your company for methodology selection.