You definitely won't get the same feeling from a Let's Play for this particular game. It's so much different being the one in control and having the emotional weight of the experience on your hands. The game is about the decisions YOU make, so if you're not the one making the decisions, then...
For a completionist path you go 'Pacifist', but if you're not that good at games, you'll have to be at least a little murderous. One of my good friends who isn't a great gamer managed to make it through the end of the game all on her own. Aside from that, just play the game how you want and don't worry. If you kill things your first time through, but you think you can manage to not kill things on another attempt, you want to try to Pacifist route afterwards. It gives you the most plot.
One spoiler-free tip I can provide that can help novices is that you can get infinite money by buying and selling Cloudy Glasses later in the game.
In any case, the game is only $10. Super affordable and there's a lot of replay value depending on your skill level and general enjoyment of things. :3 If you're still undecided, there's a demo out there that covers the
tutorial portion. :3