@JosephNewton I used to specifically target the tax lien and foreclosure auction in Ft Worth. In the 2000's, it was a great deal. Today, because of our market, everybody is a rehabber and flipper, and the tax auction is like low hanging fruit. Everyone is there. They get over bid by huge sums. Even vacant land now is overbid. You also need your cash on hand for these purchases. In Tarrant county, there is typically half a dozen auctions going on simultaneously, with bank foreclosures being read out, the tax lien auction itself, and Auction.com running their own.
I would suggest, you go down and watch the fun (first Tuesday of every month, except when it falls on a holiday). There are different providers who will offer you the lists for whatever their prices are. You can use the tarrantcounty.com (which has the auction list for free online) and TAD.com websites to find owner information, taxes paid, taxes owed, etc... You'll need to dig a little deeper to find any other liens, so make friends with a title company as well. There are still deals to be made, but it's very few and far in between.
I hope this helps a little. You are more than welcome to reach out if you need more specifics. Good luck!