i think it is much more effective to do traditional meditations teached by the buddha. samatha vipashyana. or zazen. if you really want to become a ''master'' in meditation you need to read books about meditation
a psychology of meditation by rob nairn is a good book to understand the process of mediation better. how to do it, how not to do it , what avoid , how to be.
its hard to meditate correctly if you havent listened to any teachings on meditation how to meditate correctly. there are many pitfalls and wrong ways of meditating, where you actually end up repressing and doing harmful stuff to your mind and being.
i would suggest that you inform yourself plentifully with the teachings of meditation and just perservere and practice.
om mani padme hum
If the thought of demons
Never rises in your mind,
You need not fear the demon hosts around you.
It is most important to tame your mind within....
In so far as the Ultimate, or the true nature of being is concerned,
there are neither buddhas or demons.
He who frees himself from fear and hope, evil and virtue,
will realize the insubstantial and groundless nature of confusion.
Samsara will then appear as the mahamudra itself….