Hello and welcome!
You mentioned the GVG - Of the methods used for freebase DMT, this is my most preferred. It's user friendly and easy to clean/reclaim the DMT that crystallizes on the inside of the pipe. A quick soak in isopropyl alcohol, or acetone, let it dry - you're good to go! If you let the solvent evap, then you will likely have some usable DMT.
The e-cig/electronic vaporizer can work. I have played around with it, but I prefer the GVG.
I guess the application is important, as well. If you're at home, looking for a breakthrough experience, then it will likely be much less hassle to use the GVG. If you're one of the ones who prefers to be away from your home when participating, then an e-fluid and dissolved DMT may be more convenient. I found that the ratio of DMT to the e-fluid plays a huge role in regards to e-cig and effectiveness. I consider the e-cig a more viable approach if you will be out in the woods or something like that (maybe a concert.)
Good luck on your extraction! Read it through a few times before starting. Take your time and stop if you hit a snag. It's better to search the forum, or ask in an existing thread that relates to the issue, than to "wing it."
Take care!
ACY
Sometimes it's good for a change. Other times it isn't.