Blocked Chi Flow

You are entirely correct when you point out that you cannot rush it. Practice, practice, practice and not forcing is the only way to develop. Outside of proper instruction there are really no shortcuts. The shaking and other sensations are very common as the body opens up blockages, so you usually just have to let them happen and keep practicing.

The main thing to avoid is focusing too much on what you think is moving and not moving, on the sensations, etc. - just do the practice without as much thought and it will work itself out naturally.

With regards to yin building, this, again, just comes from practice. Your restlessness will die down eventually. You should not, however, force this - and this includes forcing yourself through with over control of the breath. This is the number one way to get the "running fire" syndrome which can have a host of symptoms. If you are restless, just experience the restlessness and it will die down on it's own. If you are particularly restless and have reasons to be (work, life, etc.) wait a while before you practice. You cannot force your nervous system to slow down immediately, so a longer-term view is essential.

Have you thought about your diet? Yin is damaged by overconsumption of heating, stimulating foods such as coffee, strong spices, lamb, ginger, mustard etc. These will also make you feel more agitated and shaky. In contrast, cooling Yin building foods include things like asparagus, apple, lemon, pear, seaweed. make sure you drink plenty of water too.

If you're interested in this side of things, I recommend the books by Daverick Leggett.