What about getting big pieces of cardboard and placing them on your bed and pinning your quilt on your bed? Then you won't pin your blankets, with the cardboard down.

I have the same issue...two artificial knees. We have a king size bed. I set up a folding table with the legs on bed raisers, at the foot of the bed. I can then lay the quilt on the bed and pull up a small amount of the sandwich to work on at a time. I start with the center, then work my way down, up and out.

I go to my church basement where they have lots of tables. Push as many together as I want.

Have your local longarmer baste it for you. I do it for customers all the time!

I use my glass topped dining table. I have to move the quilt to pin all of it. Sometimes I use a folding table or plastic saw horses with a cutting board on top. I have sandwiched so many quilts that it is easy for me.

I use the clubhouse in my community and put tables together to lay it out, spray it and put it together. My sister goes to her church and I know another person that goes to her school cafeteria. Use whatever works best for you.

i just love the way 'we all' answered up and helped her out. where there is a will, there is a way.I use my large dining room table and start at the middle and work out, using safety pins.

Spray baste on a wall.

Maybe your local quilt shop has tables in their classroom already set up you can use. We have ladies doing this at our shop frequently. They just call ahead to make sure there isn't a class going on.

Since I got my new knee (actually even before!) getting on the floor is not going to happen--I use the cutting table for smaller quilts and my bed for larger ones--slip your cutting mat between the backing and the bed cover and it gives a hard surface to pin baste or baste on so you don't get the wrinkles or baste to your bed cover!