This zip file is a patch to Celtic F2P and includes only a modified SkinDefinition.XML file and new Toolbar graphic.
1. Extract the files to your desktop,
2. Copy the 'SkinDefinition_miniToolbar.XML' file to the
'My Documents\The Lord of the Rings Online\ui\skins\celtic' folder,
3. Rename 'SkinDefinition.XML' to 'SkinDifenition_Orig.XML' so you can always revert to the original,
4. Rename 'SkinDefinition_miniToolbar.XML' to 'SkinDefinition.XML',
5. Copy 'letterbox_bottom_mini.tga' from your desktop to
'My Documents\The Lord of the Rings Online\ui\skins\celtic\Toolbar'
(This is a new file so no need to back anything up).
You should be good to go with the new minimal toolbar. I've left the Main Menu button available (blue diamond) as it gives you access to all the other menu items anyway.