I ingite a piece of camphor and drop it into the camphor at the southeast of the vedi. I chant: om kravyadam agnim prahinomi duram yamarajyam gacchatu ripravahah. This mantra is for casting away the inauspicious aspect of fire.
I ignite another piece of camphor and drop it into the yajna fuel. I chant: om bhur bhuvah svar om. Then I chant om sri vaisnava namaagnaye and...

...showing avahana-mudra, I chant iha 'gaccha iha 'gaccha.

Then, showing stapana-mudra, I chant iha tistha iha tistha.

Showing sannidhapani-mudra, chanting iha sannidehi iha sannidehi.