तत् for that reason, मे my, एष: क्रतु: this sacifice, विधिपूर्वम् in accordance with scriptures, यथा समाप्यते as it could be completed, तथा in that manner, विधानम् arrangement, क्रियताम् may be done, इह(You) here, करणेषु in actions, समर्था: experts.

Therefore let the arrangements be made in a manner by which this sacifice is completed in accordance with the prescriptions in scriptures and you are experts in doing so".