Johann

Hello, I will be travelling from Nagoya Station using the JR Limited Express Nanki to Kii-Katsuura Station in Wakayama on Sunday 3rd May 2020. This date is part of Golden Week and the public holiday of Memorial Day. Would I need to book a ticket on this train much earlier than this day that I am travelling? I am thinking it will be very busy for Golden Week and I don't want the reserved section to sell out, or worse, not being able to board the train at all. I can pass through Nagoya Station on the 26th or 30th April if I should reserve a ticket a week earlier, or should I somehow try and book a ticket even earlier? Thanks so much!