Make a sword from DE. Enchant 30 levels into it. Open the item GUI to the enchantment tab, and remove all enchantments (in book form) from the sword. Re-enchant until you get desired enchantment, then reapply additional books to the sword to make it your own. The number of possible enchantments that can be placed on a DE sword are limited, so it shouldn't take too long to find what you're looking for. Do it a few times, then combine the books in an anvil till you have max level enchants.
Alternatively, go fishing for a while. Or make an automated fishing system (Golem fishermen are hilarious to me) to do it for you. You'll be drowning in enchanted books and gear (and fish and useless junk) in no time. Disenchant any gear that has buffs you like and melt the rest down in a smeltery (you do have to combine them up to full durability first) for free iron, steel, and gold.