The DIY stuff that I've read recommended a max of only one or two 20 minute sessions per week. Even if it increased what you could learn by 2.5x, that only buys you at most 1 hour (effective) per week. I don't see how that's worth the risk for the stated goal. If you just want to mess with your brain, then you might do it even if it didn't help you learn. That said, it does seem like it would be fun to play with if it was known to be safe.
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The DIY stuff that I've read recommended a max of only one or two 20 minute sessions per week. Even if it increased what you could learn by 2.5x, that only buys you at most 1 hour (effective) per week. I don't see how that's worth the risk for the stated goal. If you just want to mess with your brain, then you might do it even if it didn't help you learn. That said, it does seem like it would be fun to play with if it was known to be safe.