hedera's are very easy to convert, just concern yourself with the actual lace pattern and it's repeats. Don't worry about the toes or heels, you can replace the originals with your own.
Just make sure that you can divide the stitch pattern evenly in half. Half your stitch count on one side and half on the other.
That should be the only variation you have to do. I wouldn't worry either about if it's right side up or upside down, either way the lace pattern looks good.
Hope that helps ya hun!