Howdy there Gary. I print out my patterns, then I use painter's tape on the wood, then spray adhesive (I've used various brands) on the pattern, then gluing it to the tape. Most sprays I have found to be repositionable for a short time. I use painter's tape because it always comes off easily, even when you leave the project for a while, like a few days or so. The glue in the tape also serves as a lubricant for your blade, helping it last longer, as blades have a fairly short life span anyway. On projects with small, fragile pieces, sanding the pattern off usually is not an option without damage.
I've only been scrolling for a few short years, but have learned a lot on forums like this one and Steve Good's videos have been a wealth of information for me. These scrollers are the best and can answer most any questions, and always glad to help !
Hope this helps. Happy scrolling and enjoy this awesome area of woodworking.
Billie Ray