Using a hand crank machine is not that hard. I can do it and I'm not that coordinated. You crank with your right hand and in doing so control your speed. That controls the feeding of the fabric.
You use your left hand to guide the fabric. It's easier to do if the foot and feed dogs are in alignment and the fabric feeds straight.
I have one (1) hand crank machine and that is enough. Although I can and do use mine, I'm not infatuated with it. As a matter of fact I've been considering putting it back to electric to make it much more useable to me.
Joe