What I found helpful was to check after a seasoned nurse without knowing what she thought. Then compare. I like the idea of measuring your fingers and how far you can spread them.
My difficulty comes from telling what station the baby is hanging around . .. . ...
And I do find the docs have a different interpretation than the nurses. For one thing their hands are usually bigger. For another, they usually tell the moms they are farther along than the nurses think. To make her feel like she is actually progressing. I haven't come across a doc that thinks a woman is dilated smaller than the nurses think.
We also have that dilation chart on the wall.
steph