A bit of MDMA keeps the butterflies at bay. The ones that tickle my tummy before lift off with DMT. I love DMT to bits but I can still get a little nervy beforehand.
The first time I combined the two, I was only intending on using MDMA. However, while enjoying its effects, suddenly the idea of DMT sprung into my mind, accompanied by a feeling that I was ready for anything. It was quite splendid. I did put a report in BL, but heres th Erowid link:
http://www.erowid.org/experiences/exp.php?ID=76958
It rounded the evening off very nicely and with ample food for thought.
MDMA puts most users in a positive frame of mind (Unless you abuse it) and for this reason, it is agreat addition to your 'setting'. Psychedelics raise the stakes a little because they are less predictable. Doubling the unpredictability factor should be approached with caution, but can give stunning results. A good longer lasting phen or trypt is also enhanced by the use of MDMA as the onset of the trip begins. This way, with a little luck, your 'roll' will begin to make itself felt just after you have got used to the plateau of your trip. That is another story though.
Anyway, we're all different, so approach the situation sensibly and you should be OK. I can only comment on my own experiences. Above all, have some splendid experiences and maybe tell us what you find.
Peace - Pipp.