- Chandi is a very fierce deity. Unless one has studied her mantra from a competent teacher, I would NOT recommend jumping into such mantras directly, especially without the proper backing of lineage energies to protect if something goes wrong. Deities like Kali, Chandi, etc. are not really for all. There is a lot of preparation that is needed before invoking archetypes such as these as they can wreak havoc on the energy system if not sufficiently prepared.
- The Chandi Yagna involves a very elaborate protocol. Several thousand recitations of the mantra of Chandi, followed by pre-procedures such as an armour of protection, a ritual for “unlocking” the power of Chandi (it is locked unless transmitted through a person who has the key), etc. The actual ritual involves recitation of 700 verses. To recite the full Chandi (we call it Saptashati - the “seven hundred verses”), it takes me 3.5 hours - I do it only twice a month due to the effort/time involved. So, unless one is proficient, this could take a year or two for most to master (assuming familiarity with Sanskrit)
- How to listen to the audio? I wrote on that topic here.
This is a complex and very elaborate ritual. This is another reason why extra thanks are to be extended to Dream for making the energies from such a complex ritual available to us.
As to the frequency, every now and then should be good enough (though I do listen to it everyday). The ritual itself is performed say a few times a year by ritualists. This field however, is the basic ritual X 100 times - and Shata-chandi (100 times Chandi) is generally annually performed in large temples, etc. So, I would say, every now then, may be once a month/quarter should be good enough. Ultimately, it depends on how well you are responding to the field, or its energy (the same criterion as other fields).