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How can we get rid of these hindrances?

Maharshi: Discover the Self through meditation, by tracing every thought back to its origin, which is the mind. Never allow thought to continue. If it does, it will be unending; take it back to its source which is mind, and they (thoughts and mind) will die of inaction, for the mind only exists by thought; take away thought and there is no mind. As each doubt and depression arises, ask yourself, "Who is it that doubts? Who is it that is depressed?" Tear everything away until there is nothing but the source left. Live only in the present.

Realization is already here. The state free from thoughts is the one real state. There is no such action as realization.

From Conscious Immortality 

Conversations between P.Brunton and Ramana Maharshi