I had a hard time understanding and getting a grip of the database by just using SQLite3 so I if you like me are bit rusty with the SQL commands and want to have a graphical look of the fields and tables to double check the changes, try using SQLite Database Browser.
I havent tried using it for editing but atleast it easier to browse the tables than with SQLite3.
Can be downloaded at:
http://sourceforge.net/projects/sqlitebrowser/