I lost 10kgs twice in my life; the first time with a high carb, low fat diet and the second one with a no carb, high fat diet. Roughly same weight interval 84kg->70kg and roughly the same timeline (I was aiming at -1kg per week).
The high carb diet was tough: I was hungry all the time and I had to count calories precisely. Mentally I felt roughly like I did before the diet. Mostly tired. I didn't do much adjusting to my diet, I just had less food than before in order to create a caloric deficit.
The no carb diet was easy: I was never hungry, I had mental clarity for the first time in my life. After the occasional sleep deprivation I was feeling much better than before. I started eating twice a day with no snacks, then migrated to one meal per day with no hunger. Adjusting to the new diet came with some mistakes (eg. balancing elecrolytes to get the optimal level of energy) but after fixing them I was much better than before.