I struggled with that stuff when I first played the game actually but that was actually my first truly 3D fps I played on pc. The funny thing is, 18 years later with literally thousands of hours into it, it's expansions, mods, and sequels, I can first person platform in my sleep in just about any game. A far cry from the days when I needed to look down to time jumps. Not that that's a defence of it really. It's literally a skill I've basically spent two decades perfecting. Most people don't invest that kind of time.