[TheCrimsomBlade]

Your right you can change both professions your primary and secondary but you cant just become a single class unless you started that way. And from what I understand you can exchange all old skills for your new profession skills once you deside to make the change perminate. While your trying out a new skill you get up to 4 temp skills for each profession without loosing your already existing skills to test and see if you want to make the change.