150ft will fit just fine I believe. Take a piece of toilet paper roll or something, tape on end to it, and then wind onto it till you have half and half. Obviously you have to cut to width.
If you like to pre-wash, it takes a few times to run the pink all the way out. (hot pink at that) If you pre-wash you get a more brown color, if you don't you'll get a pink color. I can't tell the difference for print/scanning all that well, but I always prewash?
Thanks Mark, just want to give a shout out to Field, the film arrived and is not fogged or anything, a great guy to trust. Posted a neg scan of a test roll at Mark's thread above...