data feed integration expert

I have a site that has a module already in place to upload data feed files from my suppliers that will update my site with their available stock. I need an expert to determine for me whether: 1. the feed files will perform properly once they are uploaded 2. make sure it will not interfere or delete stock from other manufacturers 3. obviously be able to do this without using my actual site...i dont want to lose all my product online 4. and Make the adjustments (if needed) to the data feed mod or site so that the feed data works as it should I have never tested the mod on my site, although it has been put there. You may have to make changes to it if its not proper.