that's part of learning how to do them~ I usually make my mother help me with the hand positioning in the poses, but I tend to stand in front of my mirror and pose how I like, and take pics. I just have issues with seeing hands, so I'll make her hold things when I can't get the hands right (this one she escaped, was just me and the mirror).
Also, it may help to find pictures online with poses you like, and for learning experiences, try replicating them. Just be sure to give credit ^^