I know a few people who've done this because they knew they wouldn't be able to get to quilting and they wanted to keep it intact. Later they started from the center then went to the edges.

Ask your longarmer. I have quilted several quilts after the border was quilted or "requilted" a tied quilt. It turned out really nice.

Wannaquilt 1 - I'd try to finish it myself. Jenny from MSQC says finished doesn't have to be perfect - but at least you tried your best to finish it. I'd go with NatalieF's bookmarked page.

Thank you, NatalieF for the bookmarked page to quilt a big quilt on your own machine - I hope to try this - scary but I have a quilt that I need to finish.

If all else fails, you could hand quilt it.

Leah Day at leahday.com has a class for sale on line called How to Quilt a King on Your Home Sewing Machine, in case you are interested. I did purchase the class but have not really used it yet because I haven't made a quilt that size. I do find most of her classes or tutorials very good and the info can probably be applied to any larger quilt. So far I have quilted my quilts on my home sewing machine. On the other hand, if it is not fun or fulfilling for you, I would send it to LA.

"Fun and fulfilling" is why I hand quilt all mine.