Hello Binny
I am not going to overload you with information (just yet). I would like to see how the instruction regarding locking the knee helps you. I would like to offer you a couple of bits of useful bit of advice though.
You mention looking at one spot in the mirror or the floor. There is so much going on mentally in the class that in the beginning most students can’t look themselves in the eye. So naturally they look elsewhere. Looking at the floor in a standing balancing pose is possibly the worst place to look. It tends to greatly upset balance. If you can’t manage to look in your own eyes (and that may not be for some time yet
) then I suggest that that LOWEST place you look is at your standing locked knee in the mirror - and no lower. This will definitely help you focus your attention on what your knee is supposed to be doing and allow you to recommit whenever it unlocks.
In Balancing Stick you will look down but never look at your toes or just in front of your feet. Do try to extend your visual focus forward at least 4 ft and even more toward the mirror. There are some good instructions at this forum link About this balancing stick posture about limiting the degree to which you move into the pose, which may be what you need while you learn better balance.
The other little thing (which translates to a big thing) is to try to calm your breath, slow it down. You are already trying to calm your thoughts so that is a very positive step and great noticing.
Looking forward to hearing your results so we can delve a little deeper if that is needed.
Namaste
Gabrielle