Change domain for multisite Wordpress

#1. I need to add this to wp-config.php
...............................................
//FIXME: do comment/remove these hack lines. (once the database is updated)
update_option('siteurl', 'http://www.mydomain.com' );
update_option('home', 'http://www.mydomain.com' );
...............................................
note: as for multisite I don't get the general setting option to change the URL there ?
#2. and then would need to transfer the files to the new server , and update-import the database ....
#3. and then if needed use the Search and replace plugin .... to change the post links used by my websites' blog user.

Is this all ? or is there any thing else ?
Will this leave the multisite settings undisturbed and working ?
Thanks again for your spontaneous help and reply , so I'm much a novice, but this transfer knowledge is very essential for me.