Early in my graduate career, a professor pointed out one of my verbal ticks. When I wasn't sure about my evidence for a particular claim, I would use the word "seems." I would say something like: "This seems to indicate that..."
This was good to know, and I now keep an eye out for it. I don't just remove "seems" from my sentences. I revisit those sentences and try to figure out why I'm unsure of that argument at that moment.
My newest tick is "certainly." I use this one when I want to say something like "I recognize things are complicated, but I'm going to state things very clearly anyway." So, I'll say something like: "Certainly, Wikipedia takes account of credentials in certain ways, but..."
Again, this tick seems to indicate a lack of confidence. As my dissertation director has pointed out, I use the word "certainly" at the precise moment that things are far from certain. I'm currently excising the word "certainly" from much of my dissertation.