Personally I'm still working on sober anxiety issues and I plan to use the techniques to finally breakthrough and not just wait in ineffable terror and confusion in what I'm not sure really were breakthroughs, in time though.
2 things I can think of that you can really easily condition your mind with.1: Stating out-loud rational thoughts that refute the (automatic) negative thoughts
Example: Negative thought: "I might choke and then having troubles breathing which could make me panic while blasting off and I'll get stuck in a bad trip"
Rational statement: "While it is possible to cough hard while smoking that is a big worst-case scenario which is exaggerating the negatives. Also, I nearly always handle anything like that very well and even if worse comes to worse I always learn something from my bad trips. Rationally it is impossible to be stuck in a trip and I am extremely likely to be very glad that I did smoke that DMT and have the experience"
Depending on the severity of the anxiety your thoughts (and feeling too) may continue to be negative. If so then distract yourself with something for a bit then come back to it.
The first time you do this the effect will be the least powerful but each time you do this it will be more and more effective and can get to the point where you don't have any anxiety because those rational thoughts have gotten deep into your emotional brain through thorough repetition (like the ABC song, you can NEVER forget that) and your automatic negative thoughts will have been replaced with automatic rational thoughts.
2: Another one that is included in the social anxiety program (based on scientific-reviewed cognitive behavioral therapy) is a relaxation tape that can be used both to relax you and also there is a second tape that then asks you to associate a trigger word with this feeling of relaxation (Mine is "Tranquility" )
The program is
this one it is expensive though maybe if you live in space where copy write laws aren't present it might be available on bittorent...
Good luck!
Q21Q21's Tek: A comprehensive guide to extracting DMTThe 2 teks use non-toxic lime and vinegar and Tek 1: d-Limonene or Xylene or Tek 2: Naptha to produce very quick high yields with the greatest of ease.I am almost never on this site anymore so I will likely not answer PMs