I find the Administrators module to be really useful for editing my own information. While I have never had to add an Administrator myself, I have played around with changing my own module permissions to see how things work.
Overall, I find this module to be very intuitive and easy to use.
My favourite thing about this module:
I really like that I can easily log in and see all of my account details in one place. Whenever I need to change my password, this module makes it really easy.