It doesn't complicate the issue at all, it makes it so the HDD doesn't spin up on POST so that you can access the files directly on the hard drive rather than the hard drive making it's own drive in windows. You can also use a method called Hot Plugging, which is where you connect the hard drive after the post, but I consider this way much safer, and I've used it myself many times with great success, as I do own a computer shop, and people always want their files recovered.
Anyway, here's what they look like: http://www.tigerdire...ard Drive Docks
And having said all that, there is no guarantee that it will work, but you can find them for under 40 bucks, so might as well spend 40 before spending 1000.
Also in my shop, I use a network recovery tool, as I have a server to store it all, however, I've used EASEUS Data Recovery Wizard, and it works like a charm. So take a look at those options before spending the minimum 1000 dollar recovery charge