The Yantra comprising of Beej Mantras has to be prepared on gold or copper. It can be worn around the neck as a charm or kept in the Puja Place.
|Devotional Yantra of Ganesha|
Every day the Yantra has to be worshipped with offerings of Dhoop/Agarbatti and an Oil Diya. It has to be offer a Prasad of Jaggery and coconut pieces or Panchakhadya [this contains five different ingredients, such as dry fruits, nuts, coconut or even some spices; it is commonly used as an offering to Ganesha in Maharashtra].
Then any one of the Ganesh Mantra has to be chanted 1001 times daily for a total period of 121 days. A recommended Mool Mantra of Ganesh is given below.
Om Graam Hreem ||
ॐ ग्रां ह्रीं ||