HELP!! Newbie in Chicago suburbs

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Hello everyone---- I haven't invested yet, but I've read 6 or 7 books on foreclosures and how to acquire them. I think I have paralysis by analysis :cry: Can anyone help me? Should the first step be a pre-approval....700 fico, few assets, 90K+ income...I've started using RealtyTrac but it seems that the info. is outdated and incomplete...the best valuation tool I've seen is the BofA website so far outside of running comps. Three main questions: what sites offer good market valuations? And I don't have much cash, do you think 100% financing is out there for me from a conventional lender? And There are a few realtors that advertise in my area who invest in foreclosures and advertise big gains, they take care of everything from rehab to attorneys and selling...do you think that would be a good start, (I realize they're probably making profit every step of the way), or do I go on my own.....sorry for the babble