Accessing Attributes (basic question)

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I want to be able to directly access the attribute data for a specific product within the code. Can any one provide examples of code?

What I'm trying to do:
- We sell a product.
- one of the attributes defines a cost which varies depending on quantity.
- as it stands the customer chooses the attribute him/herself.
- trouble is they can (and do) choose the wrong option.
- I want to use the product quantity to automatically set this attribute

I'm guessing this is just a case of someone telling me what file(s) to REQUIRE and a line of code that I can copy and paste and muck around with.

Thanks