I like to browse opposing fans forums. I don't participate in the discussion but I do read their comments. I will say this, while most Bills fans are confident, they don't seem as cocky as some teams fans. Most seem to approach this game as cautiously optimistic.
I guess I can't blame them for being confident. The media has made them this year's darlings of the league. But that can be a jinx. I remember Garoppolo's first full season with the 49ers. They were the media's team that year. Then Garoppolo goes down for the season and they finish last.
Then it was the Browns. They proceed to go 6-10. They made the playoffs the next year when the media moved on from them.
For consecutive years it was the Cardinals and Kyler Murray. First year they finish 8-8 fizzling down the stretch. Second year they make the playoffs but fizzle down the stretch again finishing 1-5 and an embarrassing performance by Murray in their only playoff game.
The media sure seems to bring bad luck when they adopt a team as their darlings of the year.