Paushadh can be done without sangh or arrangements? And Paushadh all rules and duties and also is Paushadh on on 8th day of Paryushan or anytime?

Short, clear answer

1) Can Paushadh be done without sangh or special arrangements?

• Yes. Paushadh is a śikṣā‑vrata for householders to live like a sadhu/sadhvi for a set period (usually sunrise to sunrise). It may be taken at home in front of the Jin idols or Siddhachakra, with proper pachchakkhān (vow). A sangh/temple setup is helpful but not required. If a guru is not available, take the vow respectfully before the idols and follow maryādā strictly.

2) When can Paushadh be done?

• Anytime in the year. Traditionally preferred tithis: Ashtami, Chaturdashi, Purnima, Amavasya; and during Paryushan (Śvetāmbara) or Das‑Lakshan (Digambar). On the 8th day of Paryushan (Samvatsari), many observe Paushadh, but it is not compulsory. The key is right bhāv and careful observance of the rules.

3) Main rules and duties (maryādā) in simple words

• Preparation

- Clean place, simple white clothes, keep silence and restraint. - Take pachchakkhān for Paushadh; set limits of movement (deśāvakāśikī) and conduct.

• Conduct like a sadhu/sadhvi for the period

- Ahimsā carefully in walking, sitting, speaking; use soft cloth/rajoharaṇ if available; filter water; avoid night‑eating. - Observe samyama: truth, non‑stealing, brahmacharya, aparigraha in thought, word, deed. - Minimize possessions, no business/entertainment/social media, avoid vehicles and unnecessary talking.

• Daily avashyakas and sādhanā

- Samāyik of steady equanimity (multiple times if possible). - Stavan and vandanā of Arihant‑Siddha‑Sadhu; guru‑vandanā. - Pratikraman with ālochana and kṣamā‑yāchanā. - Kayotsarga (still meditation). - Svādhyāy (scripture study), dhyān on tattvas and vows. - Pratyākhyān (resolutions) to avoid faults further.

• Food discipline

- Best is upavāsa (no food) or strictly limited food like ekāsan/ayambil as per one’s strength, only in daylight, boiled water within vowed times. - Atithi‑saṃvibhāga (offering to sadhus/needful) if possible before one’s intake.

• Rest and conduct

- Simple asana/bed (often on floor or simple mat), guard the senses, patience, humility, maitri‑bhāv for all beings.

• What to avoid (doṣa)

- Carefully avoid the known “Paushadh doṣas” (faults) such as rāga‑dveṣa, falsehood, accumulation, needless talk/activities, impurity, disregard of maryādā, etc. For a simple list of the Paushadh doṣas, see this reference:

4) Śvetāmbara and Digambar notes

• Śvetāmbara: Paushadh is often kept on multiple days of Paryushan; Samvatsari day is specially auspicious but not mandatory for Paushadh.
• Digambar: Practiced during Das‑Lakshan, Ashtāhnikā and other tithis; procedure is essentially the same—live like an ascetic with stricter saiyam for the vowed period.

Essence

• Paushadh is to purify passions and practice monk‑like restraint for a short time. Even if done alone at home, do it with shraddhā, right knowledge, and careful non‑violence. The inner bhāv is more important than external show.

Helpful basics about where Paushadh fits among the śrāvaka vows: