Source: here.
The totalottara tantra is one of the important garuDa tantras of which fragments relating to special worship of mahAlakShmI are preserved by tradition. It may be done on the night of the concluding mahAlakShmI day during the sharada navarAtrI or dIpAvalI.
Of the great mantra of shrI nArAyaNa is the R^iShi; mahAlakShmI is the devatA
oM shrAM a~NguShThAbhyAM namaH /
oM shrIM tarjanIbhyAM namaH /
oM shrUM madhyamAbhyAM namaH /
oM shraiM anAmikAbhyAM namaH /
oM shrauM kaniShThikAbhyAM namaH /
oM shraH karatalakarapR^iShThAbhyAM namaH /
oM shrAM hR^idayAya namaH /
oM shrIM shirase svAhA /
oM shrUM shikhAyai vaShaT /
oM shraiM kavachAya huM /
oM shrauM netratrayAya vauShaT /
oM shraH astrAya phaT /
oM suvarNapIThAya namaH /
shrIM hrIM mahAlakShmyai namaH //
The Asana and the idol are worshipped.
Then the great of mahAlakShmI yantra is drawn with particles of sand that represent the atoms that constitute the universe.
The yantra shall have the longest diagonals of an octagon and the end of each such sector shall have 8 spikes, thus with 64 radiating extremities and 8 sectors converging in the centre.
A square sacrificial altar shall be set up and the oblations of ghee offered:
In the four corners of the altar the oblations shall be made thus in clockwise order:
oM ghaM TaM DaM haM mahAlakShmyai namaH / svAhA // X n times
oM shrAM hR^idayAya namaH / svAhA //
oM shrIM shirase svAhA / svAhA //
oM shrUM shikhAyai vaShaT / svAhA //
oM shraiM kavachAya huM / svAhA //
oM shrauM netratrayAya vauShaT / svAhA //
oM shraH astrAya phaT /svAhA //
oM shrIM GYAnAya udarAya namaH / svAhA //
oM shrIM shakaTaye pR^iShTAya namaH / svAhA //
oM shrIM balAya bAhubhyAM namaH / svAhA //
oM shrIM aishvaryAya UrubhyAM namaH / svAhA //
oM shrIM vIrAya jAnubhyAM namaH / svAhA //
oM shrIM tejase charaNAbhyAM namaH / svAhA //
Thus the a~Ngas of mahAlakShmI are worshipped.
Then the following deities are offered oblations:
oM muM TaM durgAyai svAhA //
oM gUM gaNapataye svAhA //
kShmrAM kShetrapAlAya svAhA //