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This is a guide on how to train Engineering economically.
As this is intended to save you money, buy only the materials you are sure you will need. If you run out, buy more. It is always more cost-effective to gather your own materials, rather than buying them. Avoid having extras, but if you do, try to sell them back on the Auction House.
Steps marked in green are to be considered if the required schematic of the next step cannot be obtained. They are generally more costly in metal bars. Steps marked in blue are to be considered if you plan to powerlevel up through artisan, as they include steps which will not increase your skill, but will be used at a later time. This plan assumes you have all the required schematics. If you consider these options, obtain all the standard materials, but disregard the total numbers in favor of the option totals.