I admit to only skimming the above comments.... I use my dining room table in the winter months where I can't lay my quilt sandwich outside.
I mark the centre of the backing.with a safety pin on the right side....lay it right side down on the table.... I mark the centre of the batting with a safety pin... lay that on top of the batting, matching the centre marking..... I mark the centre of the quilt top on the right side with a pin.... removing the pin that is in the batting.... lay it right side up matching the centre markings on the rest of the sandwich. Starting in the middle... I either pin baste a fist width apart.... or if I am doing intricate hand quilting.... I hand baste....from the centre out..... once everything on the table top sandwich is done....carefully shift the sandwich to the left....and repeat...and then to the right and repeat.