I posted my site to Hacker News at about 3:30 pm UK time. It was sort of a good luck charm and not based on time zones etc. Last time, when I launched my blog No CS Degree I happened to launch at that time and that got to #1 as well so I figured I would do the same. I stopped reading comments after 100 or so. Yes, there is going to be negativity but not everyone is going to like what you do so you just have to have a thick skin. I got two sales from this and 12,000 page visits in two days.