@Crell yep I still got scars from when I upgraded my very first ever PHP application from 3 to 5. I was a kid when I started writing that app, so it definitely was full of stupid shit (still is, to be honest: always only ever stuck on band aids - the full rewrite is finally planned for later this year), so the upgrade was beyond hard.
But yeah, since then I’ve learned how to code properly (I think) so upgrades tend to be a lot simpler.
That first experience traumatised me for life though, so I’m still always scared when I start …