Two things to NEVER do:
NEVER boo your own players (which goes for booing the coaches too. If you boo them it could be confused as booing the players.) Standing in silence can be a much more classy and just as effective manner of showing your disgust with the product on the field.
NEVER stop going to the game!! This does send the message you want the coaches and administration to receive but this isn't how you want them to receive it! Have fun at the tailgate, paint your faces, get your cob heads on and be there for the team! Trust me, when you are at Nebraska, the bottom line isn't how much $$ you bring in, it's how much $ you bring in and how much you win! So, by boycotting the game you will affect the $ aspect a little but, the losses will hurt much worse! Just take a look around at what is being said about Nebraska and you can see how much more pain that loss causes versus losing 5-10K from the game.
One final thought, deciding to not attend games doesn't make you a fair-weathered fan. It is a way to object to the product on the field and it might expedite the change in head coach. Or, it might not, but it's still up to the individual to determine the plan that they think is best!
Just my opinion, doesn't make it right.
Boomer Sooner!!