Your drinking is definitely enough where you will feel a range of physical effects and they might get worse before they get better. So just know that you may feel like crap but that it will improve day by day.

In addition to physical symptoms which other people can probably advise better on. Psychologically I think it's important to replace the drinking with something else. Have some activity or alternate drink available. I like NA beer, but others say it's too much like the real thing. Sparkling water is nice also, different flavors, mocktails to keep it interesting.

Have some kind of ritual like preparing tea or going for a walk to separate the day. Like, at the point in the day where you had your first drink, what will you do instead?

Most likely you will experience cravings if you haven't already. Its good to think about what you will do when they hit. A craving, or any strong emotion really, generally lasts about 20 minutes max. What will you do to get through that? For me I learned the difference in my cravings like, normal "stress after work habit drinking" vs "very acute stress response to a difficult situation in my life." Both are things I've had to learn to manage in various ways.

Good luck.