The way to do DMT, in my opinion, is to load up 40-50 mgs in a good, clean, glass pipe, empty your lungs, then slowly smoke it in until the world disintegrates, then try and hold it in as long as possible. You should be in DMT-space before you exhale.
I have never had a bad DMT trip, but DMT seems to have a greater potential to be unnerving, for me anyway, at sub-flash levels, particularly at the level falling just short of "break through". I have never experienced anything negative or unnerving when I have smoked enough to "break through", though there have been times when I did not take in quite enough for a full dissolution that I became a bit confused (still loved it though).
There is always a degree of shock associated with the warp, but DMT is so much smoother compared to 5MEO that I find DMT take-off relatively tame by comparison- and the place you end up at is so much more interesting

.
I used 5MEO and DPT many times before I experienced DMT for the first time, and found DMT to be so superior to the other two that I lost interest in them; given a choice between DMT, 5MEO and DPT, I cannot imagine ever not choosing DMT.