Wish I had an answer for you...because I have a few of those too!
What I've found is most of the time, it's my student's way of deflecting his "ignorance" of whatever he/she's supposed to be doing. A lot of the times it's not knowledge base, but behavior knowledge base. I'm working on giving really detailed written plans to my students this year when I'm working with groups. It takes a lot of time on my part, but I think it's saving time (and my patience) during the day. It gives the kids ownership too. Can't tell me they don't know what to do if it's written out in front of them!

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Good luck!
PS - Don't worry about feeling insecure. We ALL do at some point.