Umm. It isn't that complicated. Does WTHI really need a walkthrough? The dialog choices are pretty obvious to me most of the time, and if it is a little unclear, just look at the facial expressions of the character you are talking to after each dialog choice, roll-back and try each one. The devs have done a good job of using facial expressions to clue the player in to whether you are making the right dialog choice or not.
The only time walkthroughs are ever needed, in my opinion, are for some sandbox games where the devs like to make it complicated to draw out playtime without much content, you know, you must be in the living room at 3:00 PM on Sunday, but only if you've watched the sunset on the balcony last Tuesday, etc.
I try to avoid these games.
WTHI isn't like this. Just play it and be nice to the characters you like, and pay attention to the dialog.