Hi, belated thanks for your feedback. I've felt moderately confident, provided that I manage to get an acceptable GRE score, but I've noticed something else. I've been browsing the websites of a lot of graduate students of schools I've been considering (which aren't all necessarily even tippy-top places), and the results are fairly intimidating.
It seems in general, half or more grad students have some form of website with their CV on it. Of that set, it seems that >80% were perfect-grades honors people before starting their PhD. Those that weren't, often were double majors, or have an MA. I am not one of these people. My performance -in linguistics- is basically spotless, but the first half of my record, primarily consisting of random required courses, is nothing amazing.
In addition to that, I do have one F on my transcript, from a silly gen-ed course that I was totally unprepared for. I re-took it later and got an A, but I wonder whether or not this is a serious issue. Should I address this in my statements? While I feel that it is clear from my record that I am currently performing well and not a dumbass, the competition seems stiff enough that I have no confidence that I can compete.
It could of course be that there are more non-perfect individuals among the fairly substantial set of students that don't have CVs posted online. But, I don't know either way. Regardless, I'm pretty disheartened looking at the competition.