Your first spin in training with an instructor where you have been briefed beforehand and are expecting it, still feels very unusual and takes you by surprise
I didn't find this to be the case - the spin itself was somewhat tame compared to the spin entry, recovery from which, as incipient spin, which was part of the PPL training so I was familiar with it.
Mind you this was in a 152 which could be recovered from the spin simply by taking one's hands and feet off the controls.
I was somewhat surprised that the spin itself was a non-event.