Brenda,
Try repositionable spray glue, no need for thinners to remove the pattern. I'm currently using one from Crafters Companion (the purple can) and I've found it to be very good. I apply the glue to the back of the pattern, sand the wood to 240, clean off the dust then stick the pattern on. It leaves little or no residue that can't be removed with a quick sand.
https://www.crafterscompanion.co.uk/craft-essentials/glues-adhesives/glue-sprays.html