How do you change the time when DST begin and end?

I have to reset all my mechanical watches when I wear them in my normal rotation, so the daylight to standard/standard to daylight change has pretty much zero impact on my watch wearing/setting. 

It's the same with me because not all my watches are on a winder.

Quartz all get changed on the day.

Mechanical all get changed when I wear them next. 

I'm aware that DST became more of a political issue and is probably no longer relevant for saving energy. 

However, I'm pretty sure that this doesn't extend to making all months equal, so how do you change dates? All at once or once you wear?

If I'd change all watches on that day my family wouldn't see me for hours - I do it whenever I wear the watch.

I try to set all my quartz within a day or 2 of the time change. The mechanicals are probably all stopped except for 1 or 2, so they don’t really matter. 

Here in France we were supposed to drop the time change in 2021 but as I just read on the government website, "the pandemic of 2020 has delayed its application and an unpositive appreciation of the european council has made it suspended. It hasn't been reexaminated since".

I think I'll have to set my watches for few years !

I'm on the @UnholiestJedi  plan as well 

Today is the last day of a 30 day month, and I'll be bumping every watch with a calendar ahead tonight so I don't have to risk an errant display in a fortnight or so. This is also a good time to verify that no quartz batteries have died, as I don't do daily adorations like some here.

I kinda do all 3? I only have 1 watch that auto adjusts, but most of my digital casios have an option to turn dst on or off within a couple of screens. I try to adjust them all my watches at the same time, but of course I'll forget at least 1. 

The problem I have with the auto DST on/off is that it doesn't work in Israel because of course we had to implement a schedule that nobody can understand.

Yes, we are famous for keeping traditions, even those that are bad and for all the wrong reasons. I still remember how in 1981 there was a referendum about the death penalty and the abolition of the guillotine and one famous published answer was from someone who was against because his opinion was that if it was good enough for his grandfather and his father, then it was good enough for him too.

Of all the watches I have the only two that are affected by DST are my Casio Path Finder and Citizen Eco-drive. The rest are mechanical and needs time setting before their wrist time. 

In Saskatchewan the time never changes so it is not an issue.