Soooo, not to be Debbie downer here, but in the off chance you can get that egg to hatch... are you aware of the care of a baby wren? It literally involves eyedroppers and feedings every 15-30 minutes. It's no joke, and exhausting. I know you mean the best by giving it a try and I mean no disrespect and I LOVE that you love the animals- but if the egg isn't incubated right it will come out wrong, and if it does somehow come out at all, it is going to be a lot more work than you want. Nature is tough and sometimes the best thing is to leave it be, as hard as it is for us emotional creatures.
I would highly suggest you take all that love you have and get some baby chicks or incubate your own eggs if your parents will support you. Chickens, Quails, whatever you want- they have very clear guidelines for raising that work with human schedules.

You will have success and it will be better for all of you, promise.