The language barrier make things more difficult, but it can never stop a determined man! Feel free to PM me if you need help figuring out some of the steps in the DMT extraction guides here. At the very least I can rephrase or offer similar words so hopefully an online translator will (eventually!) get you to be successful.
Now I apologize if this is incorrect, but the following is in Deutsch and is a DMT extraction.
http://www.psychonaut.com/post-36233.html?f=28It recommends using turpentine. It claims this is pure naptha but I do not know this to be true. If possible you do want to find pure naptha, preferably the lighter hydrocarbon naptha but the heavier will work if it is all you can find.
It also recommends to evaporate your turpentine / naptha to get your crystals. I disagree with this. I suggest to evaporate your naptha until approximately half to a third of its original volume, and then to place it (in a covered glass jar) in to your freezer. This will cause the DMT freebase to precipitate ("crash" the crystals out of the naptha solution) out and settle down to the bottom. After approximately 6-8 hours in the freezer, pour off the naptha leaving the crystals on the bottom. These crystals are your (impressively pure already!) DMT! Success!
If you want to clean these crystals to be extremely high purity, a quick recrystallization can be done with heptane (which is quite similar to naptha, and may be hard to find in a local store). I can help explain this if you like!
You may also want to search psychonaut.com to see if there is a recrystallization guide that is french or deutsch.
You are taking the first steps to one of the most profound experiences possible! I can already tell you will not stop until you have encountered DMT on your own terms. Best of luck on your travels, my friend.