Well, friends, my lovely month long project ended.
I have many First Day Covers left so I'll be writing more letters but not on a daily basis, until some fancy to do so strikes me again.
I've heard from recipients and even gotten a couple letters in return. It's been very satisfying.
Try it, write some letters. Find a pen or two you really enjoy writing with. If cursive isn't your favorite thing, print it, or draw it. Who ever you send it to will be delighted to receive it. Trust me on this.