You'll be great. You can do it. And know that there is always a back up plan if you need it.
I picked up a TENS machine two days before i went into labour. Had a bit of a life crisis and totally forgot about it and then had a mad rush to find one. So if you don't have the baby in the next 24 hours, you might be able to get one if you want it. Most places do overnight delivery, obviously not on a Sunday though. But you didn't use it last time, so i reckon you'll be just fine.