Welcome! For years I crawled around on my hardwood floor pinning the three layers together and then crawled around some more to hand baste the entire thing. It was the part of the process that I dreaded. Then I discovered spray-basting and my world changed. Lay the backing face down on your flat surface then lay the batting on top. I lift up the batting diagonally from the edges and spray underneath it to the center. Pat it down. Next lay your quilt top on the batting face up. Again, lift up the corners diagonally and spray underneath from the center to the edges. I still use my hardwood floor - if I overspray I let it dry, then take a cloth with orange spray cleaner and it wipes right up.
Then I bring the entire sandwich to the machine and start quilting. Haven't had a single pucker since I discovered the spray.