Wasn't enough to just upvote this post. This is a very thoughtful and concise (yes, really) introduction to those considering embarking on a psychedelic journey.

In my experience, contemplative and analytical people (such as the typical hacker) can truly reach the extremes of the psychedelic experience. If too anxious or unwilling to cede control, you're likely to find yourself on a slippery slope. If however, you have a rich spiritual life based on honesty (mostly with yourself), you can explore the edges of human consciousness and open doors that most will never see beyond.

Walk softly and leave the stick at home.

+1 for the idea that psychedelics accelerate and condense mental experience. Based on my 'travels' that seems correct.