I think this is largely a situation dependent on each person's perspective and understanding of what free will and determinism really mean. I think to some, determinism resonates as "I'm trapped, with no way out!" and free will meaning "I have the freedom to do whatever the hell I decide when I reach a fork in the road". The way I understand it is basically every decision we make is processed and made based on certain criteria and there's no escaping from that fact. Even if one says "I am going to decide all things today on pure chance, the roll of a dice", is still determinism :)
That's probably the big reason why people can't grapple with the concept of determinism. "What do you mean other things pre-determine my decisions". I personally get that and am OK with that.
But, what about situations where I wake up in the morning and I spontaneously decide to do something.
It depends on what I mean by "spontaneous". To me that means with no forethought or consideration.
How does determinism play into that Can anyone state with a very high degree of certainty (just so I don't use the term "absolute certainty") that, if we were to replay that day, my neurons would fire the same way and create the same sensation of want to do X instead of Y?