No need to do worry about those quarter reps today, but I still want you to take your time on the decent. It should take you about four seconds to get from a standing position to the bottom of the hole. Yes, they're difficult. They're supposed to be.
If you've been challenging yourself with the amount of weight you squat each week, you should be pretty comfortable under some strain. That's what building your modern physique is all about: continuing to challenge yourself and getting better every single day.