It's rough no matter what you do, any time you're sitting below where your body "naturally" sits, it's going to fight you. It's difficult to describe how it feels, you'll pretty much have to experience it yourself. The good news is it's not a binary thing, it's not "if you're lean you feel like shit", it's HOW lean determines HOW shitty it feels. Also, it's pretty easy to get way leaner and more muscular than average without too many negative effects, it's only once you really cut down far, that it starts to get bad. If you naturally sit around 20%, then you can probably hold down 15% without a problem.
I'm pretty average, I sit a little under 20%, if I just eat whatever and have a decent amount of activity. When I'm down closer to 10%, I just spend more time thinking about food and being hungry than just about anything else. It does get easier the longer you maintain a certain bodyfat though. Part of that is mental, you just learn to deal with feeling hungry and being more tired, part of it's physical, your body (slowly) adapts to being and staying leaner.
The worst effect as you start to really get lean though is lower test. I had some assistance in my last big cut (though it was just clomid, which didn't do that much) but it was still really rough some days. If you've never had low test, it really sucks, the biggest thing I've noticed is it's very easy to get flustered and scared and timid AND makes it harder to keep on muscle AND makes you have even less energy. TRT will fix it outright but is a pretty extreme measure until you're really low and actually need it, or hypogonadal to begin with.
How fast you're cutting, if you're still cutting or you've started maintaining (though keep in mind, maintaining at a lower bodyfat% is NOT like maintaining your original! You need to keep basically the SAME diet and exercise as you took to get there!), and how long you spent cutting overall will make it better or worse. If you do a slow cut (<1% of your body weight per week at high bf%, down to 1/2% or less as you get leaner), AND over a long period of time (at least 6 months to get from 20% to 10%, though that's uncommon to actually achieve just due to other things in life, a year or more is usually more reasonable), you'll be more "used to it" by the time you get down, your body won't fight it nearly as much as if you crash dieted.
You said you're losing about 1kg/wk, if you're 80-some kg, then I wouldn't try to maintain that rate much longer, as your body adapts to your diet and training and your weight starts to level off, I'd target going closer to 1/2kg or 3/4kg a week, to keep the loss of energy/hunger/etc to a minimum.