I ran that exact program back when I genuinely had no idea what I was doing. (The McCallum one, not the Super Squats one.)
The real focus of it is the squats and the pullovers. The rest is kind of "filler", imo. It's not that it won't do anything, but the focus should be on doing everything it takes to make sure the squats go up every single session, which includes conserving energy on the off days, getting lots of rest, eating a ton.
You'll start appreciating that somewhere around week 5.
The first few weeks were easy, but when it started getting hard, it got hard. I could usually build a good amount of momentum up to about rep 13, and then the last 7 reps took a lot of mental work to get through.
It'll be good though. Think of it as willpower training.