Hello Ea,
Thank you very much for posting your question.
I think it is really great that you are adjusting the program to your own speed, that is really essential as the course is made for a wide range of people. Every persons body is different though.
The first Episodes contain a lot of exercises that contain bending your knees. Mainly in order to gradually build the strength for the actual handstand. I think that is what your pain comes from. In all of the exercises that involve bending the knees, be a bit mindful how much you need to bend and either avoid or shorten those exercises because they should not give you knee pain.
In the L-shape if your butt sticks out, try to focus on pushing the shoulders out/elevating them to your ears and slightly rounding the upper back/flattening the ribs. That should change the angle of your hips slightly. Most importantly it means that your shoulders are stacked properly above the wrists, which is the most important bit in this exercise. Also try to bring your feet up a bit higher in the wall. When I do it it looks like a perfect L-shape but it does not have to be like that. It is about stacking the hips and the shoulders above the wrists properly. Try also to have a little bend in the knees, that takes a lot of pressure off the legs and hips immediately.
Well done for trying so hard, for your determination and patience with yourself and the exercises
Let me know if you have any more questions,
Best wishes,
Natalie