Hello everyone, I recently started studying hands trying to build some GTO strategies. Is it necessary to have any program like GTOrange Builder or CREV to build a strong strategy as much as possible close to optimal? I can't afford any of these programs right now. I have read Ed Miller's 1 % book and he doesn't say anything about any program from these (just to write hands on paper and make ranges) so I think I could continue without them. What do you guys think? Also I'd like to ask if it's worth upgrading my account to Essential plan. Will it help me with GTO?