Yantra Guidelines

Early morning at 5-5:30 am on a Sunday have a bath and wear a yellow dhoti/saree. 
Sit on a yellow mat facing East. In a copper plate place a Rog Nivaran Yantra. 
On the Yantra place two Manah Chetana Gutikas. 
Take water in the hollow of your right palm and pledge thus - I do this Sadhana for mental peace and to get rid of all mental and physical disturbances. 
Let the water flow on to the ground. 
Next light a ghee lamp and looking at its flame chant thus 5 times. 
Gurur Brahma Gurur Vishnu Gurur Devo Maheshwarah| 
Guru Sakshaat Para Brahma Tasmei Shree Gurave Namah|| 
Next chant the following Mantra continuously without counting, for half an hour. 
|| Om Hreem Hreem Shreem Shreem Hreem Hreem Om Namah || 
Do this daily for half an hour for 21 days. After 21 days throw the Yantra and Gutikas in a river or pond.
After the Sadhna too sit daily for 10-15 minutes meditating on this Mantra. This shall surely help you achieve supreme peace.