My first few hats were done on straight needles. It's really not that hard to do. You just have to seam them once you are done. Hat part can be a pain. I usually do mine on two circular needles now though.
OTN: Jeckyl and Hyde Hat, Shetland Shortwrap( )
FO: Lacey Stole, Library Capelet, Dead Fish Hat, Tree Bark Scarf