Hey there comet@earth - just wanted to let you know that I've recently tried this as well.
I would strongly suggest starting with anything Anshad recommends because of his skill set but did want to let you know about the guide that I followed and the details of such, which can be found here.
I've been (and am using right now) Fedora 19 along side my Windows 7 machine - both are 64 bit.
Once I figured out a couple of simple tweaks that needed to happen I wound up using Fedora for about a week straight before I logged back into Win 7, it was (and is) that easy.
Here is the initial guide that I started with and here is the first set of instructions I followed.
Please note where the author of the article mentions, "Use the free GParted Live CD only if you must." I did not use it and I did back up all my docs, pics, music, etc before starting the process. << Pretty darn important as well as *making your recovery discs* from your Windows side in the event that it all goes sideways.
As I made mention in my original linked post, there are quite a few steps (at least it seemed that way for a noob like me) but I just plodded along slowly and now have been running both Operating Systems without any issues, logging in and out with access to both.
Hope the linked info helps and please let us know if/when you decide to move forward with it, inquiring minds always want to know.