Of course you can finish before Christmas!
Have you considered spray basting? Maybe you don't want to get into that, but it's quick and easy.
I sandwich mine on my garage floor. I put a king size sheet down after I've swept and do it there.
I would try to put a practice sandwich together using the same fabrics and batting just so you can get your tension and stitch length how you want it before starting.
And, don't forget to wind a bunch of bobbins before you start!
Can't wait to see the finished quilt.
Watson