Hi Shawn,
I had the same issue when I first started yoga. The classes I attended were Vinyasa Flow style classes where each movement is coordinated with the breath (Sunstone's Earth Class is similar) and I found myself either following the sequence of poses OR breathing "correctly." It frustrated me at first, but one of my teachers reminded me that the important thing was that I was breathing, because if I stopped breathing... well everything else would stop too. I kept practicing and now years later I find myself automatically breathing with the movement, and now can concentrate on my body awareness and focus in the pose/class. I think what worked for me was to stop obsessing about "doing it right, right away" and working on doing it right, as much as I could. When I would notice that my breath became erratic or that I was letting my mind drift, I would remind myself that I am working on it and re-focus. Eventually, my body awareness and focus improved.
In regards to closing your eyes. I close my eyes at various times throughout my practice. It helps me to focus inward and feel how my pose is rather than just how it looks. For example in Fire I will line myself up in Half Moon looking at the mirror to make sure my hips and shoulders are square, then I will close my eyes and try to take a memory of the pose. Then for the second set I will try to move into the pose without looking just to challenge myself. I'm still working on it and will occasionally be "off square" when I open my eyes to check, but I'm getting closer in my humble opinion. In Water, since we are in the dark, I close my eyes more often. I work on feeling the pose and examining what I'm feeling in my body during the class rather than what I'm looking at. I will admit that during the balance postures I focus my Drishti (the fuzzy gaze) on the candles to help with my balance, but I'm also challenging myself to balance with my eyes closed and focus inward for balance. Using Drishti to focus concentration helps me when I'm trying to balance, and when I started working on balancing I couldn't balance without it (sometimes depending on the day, I still can't).
My advice is to stick with it, and to try what feels good as long as it fits the format of the class. If you want to close your eyes, try it and see if it works. If it doesn't then you'll know what works for you. I love experimenting with my yoga. I've found what works for me, but I also work to stay open to what works for others. Over the past year or so I've lost a large amount of weight and so I feel like I'm doing yoga with a brand new body. I'm trying new ideas, even if I've tried it before, because I may not have been ready for it at that point, but now may be ready.
I hope this helps to move you along your yoga journey
