Impact of changing cpanel username on gallery 2.3 installation?

After I installed gallery (2.3), for security reasons I decided I needed to change the cpanel username where Gallery is installed. What I would like to do is to use cpanel to change the username and then modified the various places where Gallery uses the cpanel "username". I believe it can be done using the following procedure:

CPANEL

1. Using cpanel WHM, change username from "olduser" to "newuser"

thus the folder /home/olduser is changed to /home/newuser

GALLERY

1. In the initial installation, gallery was installed as follows:

Full installation path: /home/olduser/public_html
MySQL database: olduser_gllr2
MySQL user: olduser_gllr2

config.php (3 instances were olduser appears)

2. After I have changed the username to "newuser" in cpanel, I would change Gallery to the following:

Full installation path: /home/newuser/public_html

Edit the following to change the name:

MySQL database: newuser_gllr2
MySQL user: newuser_gllr2

edit config.php to replace 3 occurrences of "olduser" with "newuser"

QUESTION: Can this be done as described above? If not what have I missed?

I have set up a test installation where I can experiment to see if this works before I try it on my production site.

I know it would be simpler just to uninstall the current installation of Gallery, use cpanel to change the username and then re-install Gallery. However, the current installation takes up about 250 mb with 3 sub albums. Each sub album has between 5-10 of their own sub albums and the total number of photos is in the hundreds. Also their are many comments associated with the photos which I would hate to lose.