The first time with anything is hard. It was a "new" experience for you.
You may know the procedure from watching videos but the first few times of "hands on" with a furry critter will get you a little out of sorts.
My problem is I did it so little, haven't done it in so long and my knife ain't that sharp that I would be more worried I'd mangle the little critter into tufts of fur and meat shards.
Hats off to you for giving it a go.