I've listened to multiple podcasts and read analyst's predictions for this Saturday's game against UCF in Ames. I've also heard from a bunch of fans on chat boards, comment sections etc. They are almost unanimously unconcerned about UCF. We know what we have, we know what our defense can do and what our offense can do, so we're not worried about what UCF can bring especially in Ames. Obviously as the team you can never overlook, but as fans we can lol.
Oklahoma State is worse than UCF. I feel like a lot of fans and analysts are cautious about this game though and aren't sure whether BYU can close them out. BYU is just as good (or better than) Iowa state this year and they get OkSt at home on a Friday night. We should be more confident about this IMO.