@Strife
I suggest that you only buy the game if you're willing to overcome many hardships, since there are lots of more enemies that are harder than the Red-Eyes themselves.
You'll probably end up the first hours in the game just learning how to block, dodge and parry accuratedly, because those are the most essential things to survive on Demon's Souls.
I can give you tips and help should you require it, and offer you sites that can help you plan your demon's souls incursions, but no amount of help is going to do you any good if you don't put your entire soul (no pun intended) on the game itself.
As you said, it's not for everyone and it certainly is the most unforgiving game released in the past years, but it's also one of the most rewarding, should you overcome it's difficulties.
Oh, and if you find even the main quest impossible, then I don't suggest you trying New Game+.
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