if all you want to do is change icons that requires no skills of modding.
all you need is a dds plugin for photoshop and you are golden. The icons for spells/items and everything else are found in
C:\Program Files\Sony\EverQuest II\UI\Default\images\icons
you do however need to understand that changing a picture will require you to treat it as a mod. Which means you need to write the ini file and put the image in customui\images\icons\
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affair Cam