well, there are a few reasons why i would advise on not using the QT method (but it still can be used as a reference because it does have pictures along with easy to follow steps)
first, it recommends using muratic acid and ronsonol naptha, which if you plan on boiling down the volume of the DMT solution it can tend to concentrate to high levels, unlike vinegar which has a lower boiling point causing it to evaporate at lower temperatures. also, like i said earlier, ronsonol naptha does not evaporate clean so you could be 'contaminating' your DMT with other shit you don't want. just let some evaporate on a dish and see if it leaves behind any residue if you are unsure.
second, it tells you to use a pH of 2 water when extracting, which i do not advise using since DMT ionizes at a pH of 6. (a pH of 4-6 should work fine). the lower pH you use than 6, the more other shit in the bark you will carry over with you, which, well, you just don't want, hahaha. (be sure when reducing the volume to not have it too hot)
third, the ridiculous time it recommends for the salt extraction (7 days for 2nd and 3rd) which is not necessary. you can do each of them in under an hour (45 min. for each), but it does really depend on how powdered the bark is (the less powdered it is, the more time it takes for the acidic solution to penetrate the fibers) or how warm the solution is.
finally, it doesn't explain the process of washing or recrystalization which are actually very important steps if you plan on having relatively pure and 'clean' DMT without other left over residuals from the earlier steps.
like i said, just be careful with extraction procedures like this if SWIM plans on putting the product into his lungs, because you really can never be sure what is left over in the final product if you choose to skip the washing and recrystalization steps.