@gregory7715
Hi!
Unfortunately it's tricky to get the copyright allowance to publish notation and TABs for certain songs, and that's why we don't have a TAB for this specific arrangement. The lesson for "Have Yourself A Merry Little Christmas" is up on YouTube right here, and YouTube actually have a great feature where you can slow down the tempo but still keep the same pitch. (We also have that feature on our lessons here on the site). I'd recommend trying that if there are any certain part of the song that you have extra trouble finding the notes. Also, know that I'm always here available on the forum to help you with any questions! Have a great day!
Kind regards/Emil