Get phpMyAdmin and click click click.
Just make backups first. Lots.
Read the manuals at mysql.com in regards to grants and especially WHAT TO DO IF YOU LOSE THE ROOT PASSWORD.
I want a dollar from every person that was messing with grants and changed the root password or removed grants they should not have.
Understand the permissions of the system first. Makes recovering from a disaster a lot easier.
In general I find the docs at mysql.com to be really good.