This is good. You have not installed anything that will be difficult to remove. You may want to make a NAND backup before you remove anything. That way, you can simply reinstall Bootmii and restore the NAND backup when you get your wii back, thereby avoiding most of the effort of reinstalling things.
To remove the homebrew, simply launch the latest version of the Hackmii Installer (v0.6), and have it uninstall the Homebrew Channel, Bootmii (be sure that Bootmii is no longer installed either as boot2 or as IOS), and DVDx if you have it. Since you used Gecko OS, the Homebrew Channel probably appears in the play logs. If it does, you will have to format your wii to delete the play log. Finally, perform an update through the system settings (this is probably unnecessary and may do nothing at all, but if there is anything unusual about your IOSes, the update will take care of it).
When you get your wii back, it will have a new disc drive which will not be able to play DVDs. Aside from replacing the drive yourself, there is nothing you can do about this.
Edited 2 time(s). Last edit at 06/02/2010 01:49AM by jbc007.