Looking at Debian’s release-critical bugs, you can see that Trixie is close:
Testing now has fewer critical bugs than Stable, and the number is dropping quickly.
About 200 bugs still need to be fixed to get the number down to where the previous releases were done.
Maybe you can help? Bugs blocking the next release can be as simple as missing translations for the upgrade instructions.
debian updates usually go pretty smooth in my personal experience. last time i had an annoying problem with the nvidia proprietary drivers, but that was an exception (i had no such problem in previous updates) and i think it was my fault