It is really super amazing that we have Dharma and Dharma protectors to guide us through the course of our spiritual path especially one who is Manjushri. Not only does He protect us He also shed light of wisdom which is the main key to clearing our own obstacles because at the end of the day we create our own karmas. Dorje Shugden can only help so much in manipulating it, holding it and protecting us from experiencing the full swing of it all, but ultimately we are our own protector through the very actions we create daily. If we are not practicing Dharma and doing more negative then positive, even we chant mantras it is not going to help, knowing highly attained Lamas is also not going to help.
However, we ought to be glad and feel fortunate we do have some an upper hand because we do have a kind powerful Protector that would and could help us if we practice Dharma well; which is having a kind, compassionate heart well. It helps us speed the things we want achieve up tremendously fast.
The picture that you drew Positive change is a perfect analogy to explain how protector helps us - thank you.