How does item repair work?

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I'm trying to understand how repairing items works in Divinity: Original Sin. It seems like I just need a repair hammer and a low level in blacksmithing to repair higher-level items any time I like with no negative effects, which seems too easy, especially since durability seems to be the main mechanism for preventing brute-forcing through every chest and door. So, to make sure:
- What, exactly, is required for fixing an item?
- In terms of equipment needed, skills needed, etc.
- And what is the precise dependency on item level / value / type / whatever
- Is there any potential downside to fixing an item too often or too little?
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How do you fully repair items in Minecraft?
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An anvil can be damaged three times before it's destroyed - and you can see that damage on the anvil itself. On average, you'll be able to use an anvil about 25 times before it's destroyed, but it can be much more or much less depending on how lucky you are.Does repairing an item remove enchantment?
Item repair on a crafting grid removes all prior work penalties, and also removes any enchantments.What are Maintenance Repair and Operations | MRO industrial spare parts and supply chain
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