You did a great job!!!
As you do more of them, you'll get better/faster at it, it takes practice.
I scald at 145-150F until the primary feathers (largest wing feathers) come out easily. I dunk them under the water, including the feet, and check by pulling on the feathers periodically until one comes out easily. Takes mine 1-3 minutes or more, depending on the size of the bird and the amount of water in the scalder, etc. I use a candy thermometer to make sure the temperature is correct, and a bit of dish soap in the water.
You can peel the skin off and pop the nail coverings off the bird's feed and they get squeaky clean and make great chicken stock or dog treats. Also, if you want to grow out cockerels longer, you can make a bachelor pad for them. There's Articles in the Articles section that tell how to do both of these things, or you can search on here for threads about it.
For my bachelor pad, I put chicken wire down the middle of my enclosed covered run, and grew the cockerels out on one end of it to keep them away from the hens, and therefore keep the fighting down. Worked great.
It can be hard to process your first birds. I grew out and processed 21 CX in March of this year, and it was my first time slaughtering anything. It helped that the CX all pretty much looked alike and I didn't name them. Tried to care for them as a group rather than individuals.
I had 12 cockerels I grew out for 3 months (I was trying to breed olive eggers and only got 8 hens), and when it came time to process them, I was just as happy to sell them in the hopes that a few of them would find a flock home, rather than becoming dinner straight away. They were so gorgeous and such individuals, i was not looking forward to processing them at all. But if I hadn't found a good price for them, I would have eaten them. I keep my egger flock for pets, and my other flocks for breeding/selling/eating.
You can also use a torch to burn the feathers off the skin if they don't pluck well, like a cooking torch.