There are gto training packs out there, without coaching. I see where there are some disadvantages for a total course, and using straight equilibrium. Get GTO+, watch a series of videos here to simplify,
https://www.youtube.com/user/mlukich/videos. While studying, stop the video, and run the sim. Once you get used to simplification with the highest ev, start thinking of doing the same sim with population tendencies.
Not all sims will be the same, because ranges, effective stacks, blind structures, population, etc are different from site to site, and hand to hand.