Janabah

Respected scholars of Islam, As-Salaam `Alaykum wa Rahmatullah wa Barakatuh. Is it permitted to cut nails and hair before taking bath, while I’m in a state of Janabah? Thanks for your help.

I was told that you need to recite a dua'a during ghusl but wanted to learn what is the proper way of performing ghusl. Is there a special dua'a for it? If so, what is it?