The Yantra has to be prepared on a Bhojpatra with Ashtagandha Paste using a pointed wooden stick, as a writing instrument.
The recommended days for preparing this Yantra are – Diwali, Holi, Basant Panchami, Vijayadashmi, Ram Navami, Naag Panchami, any Solar or Lunar Eclipse or any Amavasya.
Once the Yantra has been prepared, the Sadhak must keep it in front of himself, light a Diya of Ghee and an Agarbatti sit comfortably, and then chant the Navagraha Stotra – You can find it HERE in both English and Hindi, the first verse is also a Navagraha Mantra.
This Sadhana has to be conducted daily [accept the Monthly Periods, if you are a woman]. After the completion of the chanting of the Stotra, you can keep the Yantra in your purse or pocket, best to get it laminated to stop it from being spoiled.