Have you tried the Stamparatus? It’s an amazing tool. It helps you line up stamps (especially sentiments) and allows you to easy make multiples because all the stamps are positioned and ready for a repeat performance.
I use it throughout the year but especially at Christmas for making Christmas cards. If you haven’t used one, I highly recommend it.
*One special word of caution though- the magnets that come with the Stamparatus are strong, which is a good thing. BUT… you don’t want to get the two magnets close together though because they will “adhere” to one another and you will not be able to pull them apart without breaking them. (Then your jubilation over this amazing tool will end in tears and you’ll have to order a new set of magnets from Stampin’ Up.)