I'm also due to start this up soon (well, I've started, but I haven't even moved - I've just watched a couple of scenes right before I took a nap because I was knackered already when I started. Anyway. I want to know if there's anything in this game that is missable and is definitely worth getting. Is this that kind of game? Or can I just roam through the storyline without worry? I'm hoping it's the latter because I really don't want to have to follow any guides or anything, I want to experience the game as if it was the first time I was playing it. Are there secrets, or is it safe?
Also, no spoilers here, please! But tips and tricks are much appreciated.