The difference between theory and reality is that, in theory, there is no difference between theory and reality, but in reality, there is.
one cheap drill for this

1. take a standard torso silhouette put a small hole any where you want

2. put a tent stake in the ground

3. Blow up a balloon the bigger the balloon the easier the drill is
4. tie a string from the balloon to the tent stake then lean the silho...