I agree with Peggy's response. DO as much as you can without causing too much pain. Then make goals to add a few seconds to minutes after intervals of weeks, months, or years.
And when you can't do it standing, sitting or lying down at all, just sit, stand or lie down and visualize yourself doing the active exercise as much as you can.
Pretty much what Peggy said.
More important than exact posture or hand positions or movements is consistency. THe same time every day can be even more important than the amount of time per day.
If you can only visualize with no movement or posture, even sitting or lying down, and can only do that in one position for a few minutes, try and make sure that it is at the same time every day. If you can do any of the active exercises with less pain or discomfort, do those more.
And if you can, try making a goal of 100 days of that exercise(s) for that amount of time (even if only a few minutes) at x time every day. Take a break at 50 days and 100 days. Then that practice will be part of you forever. You will have made a change in your channels and in your body and energy that will be always with you no matter what.
Hope that helps.
