Here's a link to Sharon Schamber's video on basting:
http://www.youtube.com/watch?v=bhwNylePFAA
There are two parts.
Are your plans to quilt it yourself? Hand or machine?
Is sending it out to a local longarmer an option?
You can always just have it basted by someone with a longarm machine - and then still quilt it yourself with whatever method you want.
If it's a log cabin, then it's really just blocks - it shouldn't be too hard to take it apart and do it in quarters as was suggested above? Or break it down into 3 strips?
There are many different methods for QAYG (Quilt As You Go) techniques to deal with this situation/problem.
I know many have quilted king-size quilt on regular domestic sewing machines. They must be very patient people. ;-)