Mantras have very deep & mystic mining in them and chanting of the mantras creates an instance positive energy, chanting and recitation of any mantra creates positive aura, but mantras have very powerful divine energy and when a person faithfully chant or recite a mantra then those dive energy or power comes out which affects you directly, so mantra not only creates positive aura rather it gives the divine power to remove problems difficulties & hurdles and protects you from all negative energies, so when you face bad phase in your life then divine power of mantras protects you from all difficulties and helps you to come out from bad phases and improves your life. Normally any person can chant any mantra in his/her daily puja, but in any bad phase or in any emergency that time requires specific mantras in definite quantity to remove problems, so in that time you should go to Ritualistic Brahamins and should perform a mantr jaap anushthan with certain quantity and definitely mantra jaap anushthans brings positive change for you and removes all negative effects, Vedik Astrology also recommends the Mantra jaap Anushthana by Ritualistic Brahamins for remove negative effect of Navgrahas.