I just changed mine in the scenic etech. Plenty of notice it needed changing as I took two weeks to do it. Very easy to do with just hands. Also has a key inside it, as have all fobs I’ve had. Does the enyaq not have one?
Same with my Clio. Dash nagged alerted me for about 2 weeks that the key battery needed replacing. I finally got around to doing it without any problems.
Incidentally, the car went in for its second service some weeks later and the nice lady at Renault reception told me to always use both keys with the car. I’ve never done that. I’ve only ever used one key (and replaced the battery if need be) and kept the spare key locked away safely at home. My cars always go back with one unused spare/second key… always. Hey, what do I know?!?! (and I’m still using just the one original key).