Trying to be aware of your limitations and exposing those in your speech is one way of reducing the frequency of having to eat your hat. "If we do that, I think

Trying to be aware of your limitations and exposing those in your speech is one way of reducing the frequency of having to eat your hat. "If we do that, I think this would happen . . ." is so much more productive than "that won't work," because it allows you to start discussing the why, without the proposer feeling attacked.