Salaah

Q: If a woman performs salah with 3/4 length trousers and then tights under them, wherein no part of her leg is visible, is her salah valid?

Q: I was performing two rakaats of salaah, and when I stood up for the second rakaat, I began reciting attahiyyaat by mistake. As soon as I realized, I stoped reciting attahiyyaat and started reciting Surah Faatihah. Is my salah valid?

Q:

1. When a man is praying maghrib alone, is it best for him to recite loudly or silently? 

2. If he chooses to recite loudly, should he also say the takbeers, samiAllahu liman hamidah etc loudly as well just as an imam would have done?

Q: In order to catch up on my qadha salaahs I have been reading them straight after fajr during sunrise not knowing it has been wrong to do so, is my salaah valid and should I re-read all my qadha salaahs that I have read at this time?

Q: What is the procedure to be followed:

1. If we missed the 2 Rakat sunnat of Fajr?

2. If we missed the 4 Rakat sunnat of Zohar prayer before Farz?

3. What is the sequence to be followed for Sunnats after Juma prayer (2 Rakat first and then 4 rakat or the opposite of it?)

Q: What should I do if I pray 3 rakaats instead of 4 rakaats mistakenly?

Q: If Fajr time expires at 7:08am and I finished my salah at 7:08 am, is my salah valid or I have to offer qadha for it?

Q: If a person has a horrible headache, and the motion from standing to sitting to Sajdah etc aggravates it, can one sit for Salaah?

Also if a person has had a very hectic day, and it feels like they are almost about to fall over, is it permissible to sit and read Salaah? 

Q: If the fajar prayer is qaza. Do I need to pray only farz for qaza of Fajr or both Farz and Sunnah? 

Q: I have been praying since my teenage years but I still missed some prayers at my early age. How can I complete those qaza prayers?