1.During Tiruvaradhanam, the Bhuta Shuddhi and mAnasa aradhanam are done sitting and it is a practice to do the rest while standing.
2.The meaning of the statement shishya pApaM kurOrapi is different; that is, when an Acharyan does not correct the mistakes of his disciple, that disciples sins are assumed by the Acharyan; the sins of the prapannan will not taint the Acharyan.
3.Sholkas and pasurams are recited during the Alankara asana and sattrumurai of the Tiruvaradhanam; some do so during the Mantra asana; some do during paryaka asana; ask your respective elders.
4.Follow the prescriptions of Tiruvaradhanam prakriyai which lays out respective upacharams for the different asana-s.
5.During prostration, one seeks forgiveness for the offenses committed during the Tiruvaradhanam, as per the Tiruvaradhanam parakriyai. It also includes prayer for Perumal to grace us for the next Tiruvaradhanam and taking permission from Vishvaksenar.