Import XML to Magento

I need help importing my dealers Product data from .XML files to my Magento Store. There are a total of 7 XML files that must be imported, each containing different types of data for each product SKU. For example, one file has all the product information, one file has all the categories with referencing SKU, one file has all the product options(or attributes in Magento) with referencing SKU etc. Most of the products imported with be "simple" products in Magento although some are "configurable" products in magento. The configurable products have their attribute values and options in another XML file. I've attached my dealers .PDF file that explains the schema and data types of the files we would be working with. Only those who've experience importing XML to Magento must bid.