Deck stairs placement change

Hello,

We have a deck on the second story of our house, right above our backyard. The stairs connecting the deck and our backyard cut right in the middle of the yard (they run parallel to our front and back property line), and we would like to move them to the side of the house. What considerations should we think about? How much space do we need to leave between the stairs and our neighbor's property line? Any recommendations on someone who could help us fix the deck (move the stairs)? Thank you.