Honestly not that hard. Since I WFH, in between meetings/research/writing emails I just watch them. switch every 1-2 episodes to the other show then switch back. I cover about 2 episodes a day per series. Everyone has their own style to watching, though.
I find it easier to juggle when the whole show is done so I can binge, I only run into problems if I'm juggling weekly shows (usually broadcasting shows) and I cba to remember schedules since I'm a night shift worker.