A word for paying attention to detail
Solution 1:
persnickety: giving a lot of attention to details that are minor or not important
Solution 2:
Pedantic is the first word that comes to mind.
According to Oxford Dictionaries, pedantic is someone who is:
Excessively concerned with minor details or rules, overscrupulous.
Some synonyms beginning with a "P" : perfectionist, punctilious, precisionist.