The xpen is a good idea, or a crate (I'm personally a fan of crate training for potty training if you are able to be around and supervising her free of the crate quite a bit). But whether it's a crate or an xpen she needs to have some area where there is no possibility of her getting into anything that could hurt her, and that is where she will have to be when you are not watching her every move.
What we did with electrical cords was to actually keep them uncovered, but spray them with bitter apple spray several times a day, preemptively. And when Nikko had access to them, we made sure they had a good coat of bitter apple on them and that we were supervising closely. During the first couple weeks of living with us, he never tasted a cord that wasn't horribly disgusting to him, and since then he has never bothered trying to put his mouth on one again. We did this because we didn't want to have to worry about cords forever, and always cover them - we wanted them to be directly associated with something gross and inedible.
But anyways, beyond that, it sounds like you are well prepared. You're going to be stressed and overwhelmed at times, guaranteed, but you are going to be fine. And you are going to be deeply in love, very quickly. :-) It sounds like you are going to make a GREAT momma.
Lauren & Nikko
PS: I don't think I remember seeing what kind of treats you have for her? Be sure you have some treats for regular training, AND a super special mega-delicious different treat to use exclusively for properly placed pees and poos. Plain boiled pieces of chicken, tiny bits of liver, etc. or my favorite, peanut butter baking chips from the baking aisle broken into thirds.
