I've only played 1.e4 as white so far (in clubs, tournaments, online, everywhere!), in the past 5 years since I learned chess. And it has been very fun, but I want to explore the dark side as well, as I do enjoy watching good positional play in GM games.
I'm sure some of you have attempted this before. I'd like to know what your experience was. Was it radically different? Did you experience withdrawal symptoms from not playing 1.e4? Did you have to learn a lot of theory just to get a playable position against well prepared Nimzos/Slavs, etc?
P.S. I know pretty much no theory in most openings beyond, say 4 or 5 moves.