pending on how open someone is on the internet, not terribly hard. Heck, you could likely even figure out who i am by just googling my username on here, since i use it for every login, including things correlating to my real name.
Though, using my email to try and figure out who i am may end up confusing you. My email is my first and last name, however, someone who apparently has the same first and last name as me seems to think its his email, and has done so for several years. I've even gotten emails from his mom. I've tried to convince these people that i'm not him, but to date, this doesnt seem to have worked.