Thanks for all your replies so far. Most people seem to be saying mushrooms, which is what I was actually thinking. Obviously being here on the DMT Nexus, I have a great interest in DMT itself, but am very cautious of such a powerful substance and think I should build myself up to it to make the most of it. I haven't looked too much into mushrooms yet, but I am familiar with the various level definitions.
So to those of you which suggested mushrooms, which level would you suggest going to? I presume the dosages required to experience the various levels will vary according to the individual's physiology and that these levels are more than likely not something than can be accurately 'navigated' to. Again, it's probably down to me and how far into the experience I want to go, but as I've no experience of what any of the side effects feel like, such as breathing walls, colour changing, auditory hallucinations amongst all the other emotional alterations, I am seeking your advice as to how daunting any of the levels' associated side effects are to the newcomer.