The best method for eliminating obstacles during meditation is that of devotion to the Lama. Thanks to this, our mind becomes "one" with the mind of the Lama.
It is not a matter of mixing one thing with another, but rather of pouring water into water. Just as the space enclosed by the hands becomes identical to the external space once the hands are parted, so also there is no difference between our mind and that of the Lama.
His is not better, ours is not impure. Such differences do not exist. This is really the secret of meditation.