I'd definitely check out BIGwooly's journal for a daring set of restrictions. That's the first journal I stumbled across on the forums and it opened my eyes to the "hardcore" style. I'll tell you what, after playing hardcore, you won't go back. Not only does it completely alter the game, slow progress, challenge and frustrate; it gives you an appreciation for the game that you would have never gotten simply plowing through quests a-swingin' your broad sword and gulping down twenty minor healing potions simultaneously. I'd also recommend starting a new character and building from the ground up. If you're into it the roleplaying aspect, imagine a backstory and motivation for your character. It'll make for an altogether richer and more fulfilling experience. So, give it try and have fun!