You're supposed to feel disoriented. Gibson is trying to capture a sense of a future that is accellerating to the point where humans can no longer exist there as we are.
The terminology is supposed to feel bewildering. Don't sweat it. You'll piece things together through context.
Stick with it. It's the kind of book that is capable of completely rewiring your brain. An absolute masterpiece.
With all that being said, maybe try reading the short story Johnny Mnemonic first? That functions as an introduction to the setting and might be a more approachable way to ease yourself into his style. Fewer characters, a smaller, more compact scenario.