I like to not give a shot and take my time. Sometimes it works and I'm relaxed. Other times I feel the pressure and I'm awkward. Some employes like to scan the items so fast that I hardly have time to pack them in the bag then they just stand there looking at me with this face while I clumsily finish packing and pay.
Here the employee just scans and does not pack. We do it hopefully faster than he/she packs then we are expected to pay. I'm in Europe. There's also self-service machines which I prefer, no pressure there and there's a single line for multiple machines, so I can take my sweet time without anyone looking at me.
Fuck that. If they want to force us to pack our own shit they can bloody well wait. I take my time to pack nicely and then I walk back to the payment system and pay. Usually the next customer is already encroaching on the pay terminal so I push them back by invading their personal space. Ever since covid and pushing for reusable bags they force us to pack our own stuff, they can reep what they they sow.