i don't know why the pic's are showing up- maybe they will in a few minutes- it looked like they (went)anyhow- you could look at the picture section and see many flannel quilts (including my flannel crazy quilt) and see you do not have to (soak) your flannel quilt- sew it together- quilt it- bind it- wash and dry it- it will be beautiful!
i have made over 100 flannel quilts- i never prewash my flannels (unless they are hand dyed and i'm worried about running dyes-which isn't too often)
use a good batting follow the stitch recommendations and it will be the softest, fluffiest, coziest quilt you ever snuggled! it is wonderful to pull a freshly laundered flannel quilt out of the dryer!!!