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"By then, you should more or less be able to start practicing it."
"Oh, there's one prerequisite-your proficiency in the Essence Chakra Refinement Technique has to be at least at the minor achievement level. The same goes for the Meditation Method."
"If you don't meet that standard, you basically won't be able to practice my Sage Chakra Condensation Method."
"At least, that's the requirement for the minor accomplishment version of the Sage Chakra Condensation Method."
"After all, the core principle of this method is to forcibly envelop natural energy with mental power, then guide it into the full circulation cycle of the Essence Chakra Refinement Technique."
"If your mental power isn't strong enough to suppress that restless natural energy, your meridians simply won't be able to withstand it."
"If your proficiency in the Essence Chakra Refinement Technique is too low, both your meridians' resilience and the smoothness of your circulation will fall short. You still won't be able to practice it."
"Of course, if you want to follow Mount Myoboku's approach to Senjutsu, without any external assistance, that's an option too."
"As long as you bring the Meditation Method to the perfection realm and can reliably enter a state of Heaven-Man Unity, you'll be fine."
"At that point, if you have enough chakra, sufficient affinity, or strong enough mental power, you can try forcibly merging Senjutsu Chakra and take your first step in practicing Senjutsu."
"What do you think? Want to give it a try? That should be the path the First Hokage used."
"Of course, the First Hokage's mental power might not meet the requirements, but he has a top-tier sage body. His affinity with nature is absurdly high, which greatly reduces the difficulty of merging it."
So, the First Hokage really had been the chosen one of