My experience is that the body adjusts pretty quickly to a new eating regime but it’s easiest to make incremental adjustments in order to get your eating window to where you want it.
If you want to get out of late night snacking you could start by limiting your cut off point to 10pm for a week, then 9pm for a week and so on until you get to a suitable time.
You could simultaneously push breakfast later in a similar fashion.
A good tip is to brush your teeth if the hunger hormones kick in and you start thinking about hitting the snacks.
Good luck. Fasting is great for weight loss and it comes with a raft of other benefits, I’m sure you won’t be sorry if you get into it.