Congratulations!
If you don't have pictures yet, can you give a rough estimate as to how big/heavy/old the snake is? Did the previous owner/breeder recommend to feed pinkies?
As a general estimate, a feeder should be no wider (better yet a little smaller) than the snake is at its widest part, leaving a slight bump ― Pinkie sounds like it must be a very small one still haha~
And you're right in best not handling a snake that is in shed, they can't see well at that time and will likely get more defensive and nippy, so try to avoid that until they're through!
The care sheet is also very useful to check out, in case you haven't already!