Fathwa - How to trim nails? Must be done within 40 days

Q:What is the Masnoon (Sunnat) way to trim nails and on which days
nails should not be trimmed?
A:The Masnoon (Sunnat) way of trimming nails is to start trimming
nails from the index finger (Shahadat) of the right hand and work your
way down to pinkie finger. Then proceed to the left hand starting from
pinkie finger and finishing up at thumb. Finally the thumb of right
hand should be trimmed. There is no sequence has been mentioned for
feet nail trimming though it is better to use the same sequence used
to do Khalal of feet (Start fromthe pinkie of right foot and finish it
up at the thumb, then start from the thumb of left foot towards
pinkie). Same is mentioned in Bahare Shariat (part 16, page 196) and
Fatawae Alamgeri (part 5, page 358), *1. There is no prohibition
regarding the days to avoid trimming nails. Whichever day the nails
are trimmed on is Masnoon because there is no proven Hadis
aboutprescribed days. But in some Zaeef (weak) Ahadees Wednesday is
prohibited for trimming nails. Therefore if Wednesday is the day of
Wajoob (Wajib to perform nail trimming). For example if a person has
not trimmed nails for 39 days and 40th dayis on Wednesday and if
he/she does not trim nails on Wednesday than40 days would be
completed. Then it will be Wajib on him/her to trim nails on
Wednesdaybecause it is prohibited and Makrooh-e-Tehreemi to exceed
40days without trimming nails.
Allah Tala Knows The Best.