One the subject of Dark Souls: I haven't played Demon's Souls, but I have played Dark Souls 1 and 2. In the first Dark Souls at least, with few exceptions, it is entirely possible for an observant player to beat the game without dying. Also, you probably remember that in Demon's Souls you lost half your max health upon dying. That mechanic is gone in Dark Souls. I really wouldn't recommend just watching a let's play as I feel the game really takes advantage of the medium, and just watching it wouldn't be even remotely close to the same experience. If you must, might I recommend the let's play series done by Christopher Odd, which can be found here: