One... everyone's life is interesting enough to journal everyday for December. And if you think it isn't them there are a billion prompts that you can write about. Some of my favorite pages are when I'm reminiscing about my Christmas as a child. So you don't just have to write about your day. You can write about whatever you want for each day.
Two... If putting the album together gets to overwhelming after a few weeks, and you just don't feel like finishing it in January. I have seen more than a few people just insert that reindeer image in the back of their album (a lot of them were well known people in the crafting industry and on youtube) and call it finished. After the second week of December usually I will loose steam on the project and stop actually making the pages but I will continue to write about my days (usually in an email to myself from my phone so I make sure to do it and have the date on it) and take pictures. Then when the lull of activity happens in mid January it's really easy to print everything out and put it all together. And then I get to use up some of my Christmas paper stash. I think I might do a video on all of this. Because it does really feel daunting. The first year I did it I almost gave up like 3 times, but then I realized I just had to figure out a better system for it. And this album is really a Christmas present to myself. Time is just going by so fast, and my mind is not remembering the nuances of how my time is spent anymore. And one of my favorite things is going back and remember just what I was doing at this time a year ago so I forced myself to finish it, as I will do this year as too. Also, it's a great place to put Christmas cards you've received. I kind of want to do it for my birthday month too, but we will see how I feel after I finish this years album.