I remember my first time, it was a 286 wearing a basic beige chassis, I roughly grabbed the top panel, pulling sharply and lifting it up. Underneath all the delicate parts were revealed to me. It wasn't my first time looking inside, but this time I was going further than before.
I got out my tool and gently unscrewed the mainboard, tossing aside the floppy and HDD cables. Once I had it in my hands, I searched the top, my young hands fumbling for the small silver nub I had only seen in magazine pictures before. Finding it, I carefully eased it out of the socket, pulling the new clock crystal from its box, I squeezed it back in, pushing every pin down firmly. Having finished I slid the mainboard back into the chassis, and pulled back on the cover.
Pushing the power button, I smiled as the monitor came to life, a quick check revealing that I had succeeded in replacing the clock crystal and overclocked the machine.