Hi Addy,
I have been in EMDR therapy for over a year and we have not done much of the biostim at all yet (eye movement/headphones or any other type of biostimulation). I may have done it twice or three times. My T (who worked closely with the originator of EMDR) felt that I needed to work through a lot of stuff and get more grounded before really embarking on that part of it. At first this upset me a lot and I was angry about it because I had been hearing from others who just started it right away and saw quick results and I thought it wasn't fair that I couldn't do that too. I was under the impression that the eye movement, or whichever biostim choice you use, was the crux of the treatment. My T assures me that the brunt of the work is the prep work, and the biostim is kind of like the last thing you do once everything else is in place. After some more supercharged memories were uncovered, I realized she was right and that it would be dangerous for me to do the biostim stuff if I hadn't done the exploratory and grounding work first.
So I've been working with her for a long time and we have done a LOT of work and achieved a great deal. I've picked up tools (inner child work) that are really effective and helping keep me in the present or give me the ability to pull back into the present much more easily than before. So it is working, things are moving, energy is shifting, I'm feeling more 'together' than I was, and we still have not gotten into the biostim stuff yet. So don't worry -- you can actually move a few mountains and feel a huge difference even before getting to the biostim! You're still doing it ;) Good luck to you!