I prefer to quilt without a hoop. It's just more comfortable for me that way. The only precaution I can see is to be careful not to pull your stitches too tight. All a hoop really does is keep things taut. Your quilt should be well basted for any quilting, machine, hoop or no hoop. The only time you don't have to baste is when you have a fancy frame that doesn't require it.
Rebecca
http://www.quilterscrossroads.com