At the same time I started drinking a strong pot of Earl Gray tea every morning to try get my butt in gear and outside in the dirt quicker. Normally I'm not a caffeine user. For the first week of this, my teeth would chatter and hands shake after finishing the pot of tea, it was very reminiscent of a cocaine bump. And it certainly worked well for motivating me to get busy.
But something I learned was my endurance went to shit on the caffeine. I was super impatient and wanting to do everything as fast as possible, while doing fundamentally slow long-haul heavy-mode operations. It turned out I got less done with the caffeine than without. I'd quickly burn myself out inadvertently trying to move everything faster than they were ever going to move with just my manpower. It was like the stimulant tricked me into operating deep in the realm of diminishing returns where I'm putting in 200% effort for 10% faster movement, while making myself frustrated with how long it's taking.
Now I don't think caffeine is particularly useful for anything physical that doesn't resemble a sprint, at least not for me. The psychological effects just increase the likelihood of burnout by mistreating an endurance task as a sprint.