You can tell what eggs are fertile by shining a light through it, if you see veins and a dark spot, it’s fertile, if you see nothing, it’s not. And baby birds are not hard to care for, as long as you have the time, b/c baby birds need to eat at least every two hours. I had a baby mocking bird I hand raised after a storm ripped it’s nest out of a tree, killing it’s other siblings, and it was very fun, and I learned quite a bit in the process. I let it go when it learned how to fly, and it reunited with it’s mom, and it’s mom was actually feeding it! I was surprised since it was imprinted on me, b/c I found it before it had opened it’s eyes. I was thankful, b/c I didn’t know how to teach it to feed itself. Anyway, I would definitely go for the hand rearing, it’ll bond you with your bird, and if you take it before it opens it’s eyes, it will think you are its mom.