Oh goodness. Ok, You had a good idea to start with! Why call a professional, when you have th equipment to do it yourself?! Just remember, PRACTICE MAKES PERFECT. We all have to start out being terrible, to get better. First, make sure she is secure, someone either holding her or she's in a washrack (or something of that nature, where she has nowhere to move around and you can stand outside the metal bars in a safe area since she likes to kick), always start at the neck and shave in the direction of the hair growth in no more than 8 inch strips. Then when you go to do your next strip, slightly overlap your first. Work from the neck all the way back, and alwayshold your clippers at the same angle. Did you end up fixing this yourself? I'm sure it turned out better than the first attempt. :)
My biggest recommendation is to train the kick out of her. Get her use to her whole body being vigorously rubbed down. Do it every day! This will help her feel safe while being clipped, and keep you safe. Good luck!!!