Arrive early to look through your truck. If you have lots of bulk in your aisle, take pictures of the labels and deliver those items immediately after your air or even during your air if time allows. You need to be able to move up and down your aisle or you'll get overwhelmed.
If your loader hasn't done so, write the numbers on your boxes, you'll spend much less time looking for packages during the day.
If you have ground mixed in with your air, I used to pull the ground from wherever it was in the truck and pull it to the front, this way I didn't have to slug through a bunch of boxes to get to the 6000s or whatever and stress myself out while trying to meet air commits.
I would always sort during my lunch. I would break my 30 minute lunch into two 15 minute chunks and sort in delivery order by my diad. That way you get to your stop, get the box, and go. No thinking necessary, total focus on learning the route.
Talk to your oms every day you get back to see if you scratched. Keep track of your working days and scratched days. Once you get five in a row you're good to go!
Finally, take a deep breath. Go smoothly. Run!