Pre-foreclosure listing on Zillow. I’m new, please help!

[Stacy Lambert]

Question: If I find a Pre-foreclosure listing on Zillow, but it mentions that it's thru auction.com, do I have to contact the realtor listed or can I door knock and try to make a deal with the home owner? Also, does a real estate agent have to be involved at all? Or can I get it under contract and just send it to my title company?? Please help! I'm brand new to REI. TIA!