Pro tip (800 hours in): Feel free to go at max speed UNTIL you're approximately 10-11 seconds out. As soon as the indicator says you're 10 seconds out, move your throttle to the center of the blue "optimal speed' indicator and keep it there. You'll never overshoot and you'll more or less maximize your efficiency.
Remember, rookie:
0:10 second mark.
Also, fun fact: if you supercruise towards a station and float in between the station and its orbiting planet, you'll always come out in front of the station. I've tried to explain this before, but forgot there was a handy video just for this:
https://www.youtube.com/watch?v=NyqpvtLnYq8
You'll be using this technique forever once you get the hang of it. Thank me later.
edit: consider this an essential tip for smuggling. every second counts when trying to avoid being scanned and if you come in from behind a station, the odds you'll get seen and scanned increase dramatically.