It's good to research and research some more to narrow down which headphone you think will be the best fit for you, but eventually you've got to just try them yourself though.
There's no substitute for actually wearing a headphone and using it for a while. That's why the FS forum here is always bustling and full of headphones for sale. People just have to try them out, and if they don't like them they just sell them to move on to another headphone. That's how Head-fi works, and it's completely normal.