This variation of Bhujapidasana is definitely challenging and demands more concentration than the more popular and perhaps beginner/1st phase variation pictured here. Both will most likely take a few years of patient and persistent practice to polish up.
Just like everything else in Yoga practice it comes with practice, and not just practicing this particular posture, but also many other postures, like the open hips of Upavishta Konasana and Baddha Konasana combined with the strength of Chaturanga Dandasana for example.
The old cliche holds true... It's not so much the destination that reaps the greatest rewards, but the journey. In this case the "journey" of showing up consistently, learning to breathe calmly every time you fall over and/or face discomfort, as well as developing a body that is both strong and supple, that can more easily take and recover from life's inevitable blows.
Even if you never get to this particular "destination" of Bhujapidasana, it is certainly the "journey" that is going bring the most benefits into your life and relationships.
To view a video demonstration of Bhujapidasana click here.
Jason D Schramm