The first step before placing the yantra is to purify the body and freeing the mind from any bad and negative thoughts.
Next, is to find a place on the floor which is undisturbed and facing the east direction.
Light a lamp or incense.
Place a fresh fruit and flower on the altar.
Lay the yantra with a picture of the god which the yantra symbolizes.
Next, take water from any leaf from whatsoever tree and sprinkle some on yourself and then on the altar.
Close your eyes now and concentrate on the higher power with all sincerity and pray that god fulfil all your wishes.