"Everything is difficult, until it isn't." - basically starting anything worthwhile is always difficult

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How far did you get? Did you do all the steps in part 1 and then test that it did not break anything? Or did you try and do it all at once? Step 1 needs to be done first. The rest can be done in different ways that you may find easier.
Are you creating your own mod or building on another? If another, which one? Some mods have different (better?) ways of adding content such as resources.