After a few years in the service industry i decided to go back to retail. Over the years I was away things had changed so much that i have to rely heavily on my trainer.
Awww man, yeah the retail stores tend to change some stuff up, and sometimes it feels like you have to start all over again, but I'm sure you can push through! 
Yes its kinda like riding a bike in some senses there are familiar parts. A few small differences and details that you have to make sure have been pointed out to you.
I'm glad it's not all different though. I'm sure the trainer will be really nice to train you because you sort of know what's going on, but just need a run down for the new responsibilities !