I don’t remember where I was at the time. It was about 18 months before I was born, so depending on your belief in reincarnation…
I’m about 70-30 on the “Oswald acted alone” front. (I used to be about 60-40, but as I get older, I get more skeptical of conspiracy theories.)
My main reason for leaning that way is that I just can’t believe anybody would be able to keep a conspiracy the size of the alleged JFK one secret for 50 years.
“But altered evidence! Faked documents!” Well, maybe. But once you start letting all that stuff in, you’re really going down the rabbit hole to the point where truth and fiction are completely inseparable and indistinguishable. That way lies madness. Maybe I’m naive, maybe I just want to bury my head in the sand, but I’d rather believe Oswald acted alone than believe in a giant national conspiracy led by The Cigarette Smoking Man (or someone like him). “Let me have my toaster and my TV and my steel-belted radials and I won’t say anything. Just leave us alone.”
I wish I could recommend a good JFK book to you, but I’m not that well read in the literature. Heck, I haven’t even been to Dallas and toured the Sixth Floor Museum, though that is on the agenda for sometime soon.
On the other hand, James also recommends Mortal Error: The Shot That Killed JFK, which made me go “Whaaat?”. I remember when that book came out. Admittedly, I didn’t read the whole thing: I thumbed through it in the bookstore, and flipped to the end to see how it came out. I thought this was a completely crazy theory then, and I still think so now. James spends a fair amount of space detailing the “Mortal Error” theory and why he finds it convincing; I think there are a lot of questions James simply ignores or glosses over. (tl,dr version of the theory: Oswald got off two shots, but JFK was actually killed by a negligent discharge from a Secret Service agent’s AR-15.)
(And I owe you guys a longer discussion of Popular Crime.)
Here are two of my favorite related videos. CBS News hires sharpshooters and attempts to recreate the shooting. (Bonus: the dulcet tones of Dan Rather, for those of you who have been missing the sound of his voice.)
And I’ve referenced this before, but I don’t think I’ve ever embedded it, and the link I did use is broken, so: Penn and Teller explain why JFK’s head moved the way it did, using a honeydew melon, fiberglass tape, a Carcano rifle, and a pink pillbox hat.