WordPress allows you to post in advance. You can set a post to be published an hour, a day or even a year from now. This can come in handy when you are going to be traveling, or if you want to provide yourself a cushion of posts in case you forget one day.
You can learn about how to schedule a post here. It’s easy and fast and might just make your challenge much easier.
(Pssst: this post was scheduled hours in advance – I’m actually asleep right now!)