It is always better to take help of the professional in the field - You may adopt with good intentions but later due to technically faulty or otherwise defects in the documents the sufferer could be the one getting adopted.
Legal understanding by non-professionals by reading on their own may sometimes cause problems -
Sardarji got the fourth child.He fills data in the birth certificate.
“Mother: Sikh.Father: Sikh.Kid: Chinese.”
“How come you write “Chinese” when both parents are Sikh?”
” Aah, read a newspaper, it says that every 4th person born on the Earth now is a Chinese.”
Legal interpretations by non-professionals could be like the sardarji -