I think dssxxxx was responding to the OP, not you?

And I agree with them. If you have the slightest doubt, or if you are in the mind-frame that your first line of thinking is 'you don't know unless you've tried it' then you probably shouldn't be sitting in the exit.

Rather than thinking 'i don't know' you should be doing a quick check-list in your mind 'check for fire, remove cover, pull handle, throw out door'.

As for 'evacuate evacuate' - it may be that you never hear such an instruction, for a variety of reasons. you need to be ready to act even in the absence of such an instruction.