The ironic thing in trying to accept life's impermanence, is to accept that you will not always accept it. At times you will assume that you can continue along a path you have begun due to the sheer will power and strength that you think you have within yourself. But, eventually that too will fall away and you will be left wondering, frustrated at why you could not control life better.
Then, ah ha, you remember - yes, something about life being impermanent. "Why couldn't I remember how impermanent life is when I was making assumptions about my level of control over life?" you think. Well, the answer to that is that life is impermanent. You should not expect to remember every critical principle of life exactly when you think you need it. Instead, accept that you will remember every critical principle of life exactly when you do need it. The value of these concepts are solidified through experience, and that experience can often be painful, discouraging, and somewhat regressive (at least to our own frenzied minds).
The key is to understand what drives you. If it is anything external then your motives will eventually cause an implosion. On the other hand, if your driving force is within you then no circumstance, failure, or expectation can contain you. You are then your own cause and you create your desired effects.
