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LapLap I thought about suggesting doing the route with 2 full check in sized luggage, a kid who needs the bathroom halfway through, and opposite traffic during rush hour but that just seemed too mean and likely to traumatize. Station construction already makes it disorienting at stations I'm familiar with (and I'm no slouch at Ikea with shortcuts). You get street cred for even attempting Otemachi to Tokyo with a buggy without a guide or dry run during a quiet time.
TokyoLens has a video which points out some useful points to turn for the same route.