Hiwula hit the winner in their FA Cup win over Crawley Town.
Hiwula told the Western Daily Press: "I knew it was going to come some time and I'm glad it came on Saturday. I felt I worked hard all week. I kept on practising my finishing and it finally paid off.
"It was about keeping the mental state, keep going, keep working the keeper and the goal came. All week I had been working on getting my body across defenders and it came off. The defender was in front of the ball, I got across him, I took it to the side, around the keeper and placed it in. I have been working on taking on the keepers as well.
"I have been watching clips of defenders in League One and how they play and trying to adjust my game. It's different playing under-21s football to League football. It's about getting my goals now.
"At youth team level I have scored lots of goals so hopefully I can kick on now."
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