I just got done with pin basting a quilt about a hour ago.
I like to lay out my backing on the carpet in the family room and pin the edges all around it using safety pins, slightly taunt. I mean sticking the pins actually in the carpet to hold it, I had tried taping down in the kitchen and it didn't work for me. I then spray it with adhesive, lay down the batting, then the top and pin it all together, careful not to get the carpet. I divide the quilt up in quarters and only do that much at a time. I always had puckers before doing it this way.
Mary