I'm only having reserved seating for immediate family, grandparents and anyone who helped with the wedding (violinist, pianist, priest, etc). I'm putting name tags on their seats and "reserved" signs on the tables. That way they get the best seats. Everyone else will be seating themselves. It's less stressful that way, and like someone else said, you won't know for sure of the exact count or list until probably the week of the wedding, so unless you like extra stress, just let it slide