Hey hey hey!
So, here's a friendly tip...
Get your notebook and pen, make yourself some coffee, get some bread :v and prepare to not sleep until the sun rises.
You gotta think like Dave, act like Dave, and be Dave.
Pay real close attention to the dialogues. I'm serious.
And trust yourself, even if you make a bad choice, don't go and reset everything, just continue :p
Yup, that's it.
(Sorry for my terrible English.)
Peace~