Tricking the mind
There's nothing worse than approaching a set and realizing how many reps you have ahead of you. I developed a technique back in the day when I was picking orders to make quantities seem less, not only did it carry over to the gym, but it has helped me significantly. I count in pairs, so instead of counting 1-10, I count 1,1,2,2... and so on. The mind has to be one of the biggest obstacles in the gym, and hinders people from achieving what they're capable of. Try it out, may not work for all, but it's another tool to overcome that roadblock.