Relay writing of Lalitha Sahasranamam

Kindly let me know the exact way of chanting lalitha sahasranamam. I mean ,should I start with the names itself? If I decide to do it from 40 days, is it ok to do it on period days also?
Thanks

 

Nishkarana nishkalanka nirupadhirnirishvara Niraga ragamadhani nirmada madanashini – 46

Nishchinta nirahankara nirmoha mohanashinee Nirmama mamatahantri nishpapa papanashini – 47

Nishkrodha krodhashamani nirlobha lobhanashini Nisandhaya sanshayaghni nirbhava bhavanashini – 48

Nirvikalpanirabadha nirbheda bhedanashini

Nirnasha mrutyumadhani nishkriya nishparigraha – 49

Nistula nilachikura nirapaya niratyaya

Durlabha durgama durga dukha-hantri sukhaprada – 50

Dushta-dura duracharashamani doshavarjita