How hard is doing squats with 2 dumbells?

So im used to doing squats with 1 52.5lbs dumbell so i decided to do sqauts but with 2 33lbs dumbells as a way to start going up in terms of legs. My god that was way harder then i was expecting lol, i did 4 sets of 8 with 30 second breaks in between and i was really tired by the last set. 🤣