An elucidation on Puraścaraṇa of Caṇdī navārṇa Mantra and Durgāsaptaśatī

The text of the book Durgopāsanākalpadruma mentions the various ṛśyādi nyāsas for caṇḍī navārṇa(which,if one has even a half decent guru,one should be knowing about:At least one of them),following which the following are listed as the famed ekādaśa(eleven) nyāsas for caṇḍī navārṇa,which are:

  1. mātṛkā nyāsa
  2. sārasvata nyāsa
  3. mātṛ-gaṇa nyāsa
  4. nandinyādi nyāsa
  5. brahmākhya nyāsa
  6. mahālakṣmyādi nyāsa
  7. mūlākṣara nyāsa
  8. varṇa nyāsa
  9. mantra-vyāpti nyāsa
  10. ṣaḍaṅga nyāsa
  11. khaḍginyādi śloka-nyāsa

A note for those who are looking at the above list of nyāsas:If you,the reader’s guruparamparA has a different sequence or emphasis on nyāsas,or more or less nyāsas,the krama as instructed by one’s own guru is to be followed.
Followed by the mantra-varṇa nyāsa and then the classic dhyānas of mahākālī(khaḍgam cakreṣu..ṃadhuṃ kaiṭabham),mahālakṣmī(akṣasrak..pravālaprabhām…sarojasthitāṃ) and mahāsarasvatī(ghaṇṭāśūlahalāni…daityārdinīm) and then the text specifies

evaṃ dhyātvā japellakṣaṃ catuṣkaṃ taddaśāṃśataḥ।
pāyasānnena juhuyātpūjite hemaretasi॥

and then specifies the pīṭha and āvaraṇa pūjā of the mantra-deity.The section ends by stating:
evaṃ siddhe manau mantrī bhavet saubhāgyabhājanam।
mārkāṇḍeya purāṇoktaṃ nityaṃ caṇḍīstavaṃ paṭhan।
puṭitaṃ mūlamantreṇa japannāpnoti vāñcitam॥

Meru tantra as quoted in the Caṇḍī bhakti vinodinī of Navamīsiṃha states:

caṇḍīṃ dhyātvā japellakṣacatuṣkaṃ taddaśāṃśataḥ।
pāyasānnena juhuyātpūjite hemaretasi।
tarpaṇaṃ mārjanaṃ caiva tathā brāhmaṇabhojanam।
sarvasādhāraṇam tadvacchaṇḍīpāṭhapuraścaram॥

Now on puraścaraṇa of the whole Durgāsaptaśati,Navamīsiṃha in his Caṇḍī bhakti vinodinī further quotes the vidhi of the Māricīkalpa

saptaśatyāvidhānam ca puraścaraṇapūrvakam।
yogāṃśca vividhān vakṣye sarvārthasya ca sādhakān॥
kṛṣṇāṣṭamyāṃ samārabhya yāvatkṛṣṇacaturdaśīṃ।
japedekottarāvṛttiṃ devīsūktena pūrvakam॥
rātrisūktaṃ japedādau madhye saptaśatīstavam।
prānte devyāśca suktaṃ ca pauraścāraṇikaḥ kramaḥ॥
tadante havanaṃ kṛtvā pratiślokena pāyasam।
rātrīsūktaṃ pratiṛcaṃ tathā devyāśca sūktakam॥
hutvā’nte siddhayaḥ stotramādau pūjādikaṃ mune।
saurvarṇīṃ pratimāṃ devyāḥ kārayanniṣkamānataḥ।
yantraṃ vā kārayanmantrī tadardhaṃ cāpi śaktitaḥ॥
maṇḍale sarvatobhadre ṣaṭkoṇāṅkitakarṇike॥
vakṣyamāṇena vidhinā pīṭhaṃ devyā prapūjayet।
jayākhyā vijayā bhadrā bhadrakālī tataḥ param।
sumukhī durmukhī saṃjñā paścādvyāgramukhī tathā॥
atha siṃhamukhī durgā navaśaktīḥ prapūjayet।
svasvamantreṇa vidhinā pūjanaṃ tu yathākramam।
āsanaṃ mūlamantreṇa dadyādyktena sādhakaḥ॥
mūrtiṃ mūlena saṅkalpya tasyāmāvāhya pūjayet।
saṃpūjya vidhivatpūjyāmupacārādinā kramāt॥
mātṛkā gaṇaśaktīśca pūjayedvidhipūrvakam।
naivedyāntaṃ samabhyarcaṃ tato dhyānaṃ samācaret॥
mantreṇa navadurgāyā athavā jātavedasaḥ।
navākṣaryathavā mantro durgāmantraṃ praśasyate॥
idaṃ stavaṃ japeddevyā siddhidaṃ stavamuttamam।

May that motherly Sarasvatī who ever helps her votaries begining from the hoary days of Kavaṣa Ailuṣa be pleased.