David Velleman's concept of epistemic freedom provides a way to agree with both CronoDAS and Richard here. We can "predict" our acts in the broad sense of forming correct expectations. But we also know that we could form the opposite expectation in many cases and be correct in that case too. Last time I bought ice cream, I expected to say "chocolate" to the person behind the counter, and I did. But I could have expected to say "raspberry" instead, and if I had, that's what I'd have said.
Some prophecies are self-fulfilling. When I said "I'll have chocolate", that not only correctly predicted the outcome, but caused it as well. Self-fulfilling prophecies often allow multiple alternative prophecies, any of which will be fulfilled if made. Velleman says that intentions for immediate actions are typically self-fulfilling prophecies. There may be more to intention than that, but there is at least this much: that intentions do involve expectation, and the intention itself (and/or closely associated psychological processes) tends to bring it about.
Given the spike in free-will debates on LW recently (blame Scott Aaronson), and the usual potentially answerable meta-question "Why do we think we have free will?", I am intrigued by a sub-question, "what would it feel like to have/not have free will?". The positive version of this question is not very interesting, almost everyone feels they have free will most all the time. The negative version is more interesting and I expect the answers to be more diverse. Here are a few off the top of my head, not necessarily mutually exclusive:
Epistemic:
Psychological:
Physical:
For me personally some of these are close to the feeling of "no free will" than others, but I am not sure if any single one crosses the boundary.
I am sure that there are different takes on the answers and on how to categorize them. I think it would be useful to collect some perspectives and maybe have a poll or several after.