The 19-year old forward, who joined Hibs on loan from Sunderland last month, played a full 90 minutes as the Edinburgh club were eliminated by the Championship outfit in the fifth round.
Watmore admits his debut at Easter Road was somewhat of a baptism of fire and after embracing it, is looking to really develop his game during his spell with the Hibees.
"I don't think I'm ready for the Sunderland first team," he told the Scotsman.
"For my development, the next stage was definitely to come and get first-team experience - I don't think I would have got that at Sunderland.
"It's a stepping stone, and I'm really glad that I'm here. It's a good club to get experience at, and I'm very grateful and lucky for that. It's all part of my development. Everything I learn here will make me a better player.
"I want to learn a lot, and get better with my end product - crosses. And I want to chip in with a few goals, and get bigger and cope with the physicality even more."
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