Getting automail is an extremely taxing endeavor. During surgery one cannot be put under with anesthetics because that would mess with the procedure. Connecting the limbs is a painful process; one that makes most - if not all - grown men cry. The average recovery rate is three years. I've seen it done in one year, but that was a very special case. Here Hiccup is trying to use healing magic to speed up the recovery time, but he still needs to relearn how to use his limb from scratch. No matter what it is a long ordeal.
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Getting automail is an extremely taxing endeavor. During surgery one cannot be put under with anesthetics because that would mess with the procedure. Connecting the limbs is a painful process; one that makes most - if not all - grown men cry. The average recovery rate is three years. I've seen it done in one year, but that was a very special case. Here Hiccup is trying to use healing magic to speed up the recovery time, but he still needs to relearn how to use his limb from scratch. No matter what it is a long ordeal.