Until you can find someone with experience, you might want to google some basic groundwork videos. At least it will give you something to see and try, until you can have someone come and show you hands on.
Two quick tips I can give you, if you don't have a rope halter, (or sometimes even if you do) constant pulling or pressure, not matter how hard isn't going to work in the long run. You can pull on a rope or push on a horse's side until the cows come home, and a horse will eventually learn that they can take whatever you dish out.
Instead opt for quick, sharp, tugs on a rope or taps with a stick or two fingers. They won't hurt the horse, but the incessant pop, pop, pop, pop of sensation that goes from light, to hard will eventually irritate the horse enough to try to move away. As soon as the horse does, stop immediately.
Stopping the thing that is irritating is the reward.
I had to remind myself of this today doing hooves. My natural inclination is to work on the hooves while she is standing still and being good, but that irritates her and she reaches a point where she expresses, usually by pulling that she's had enough. I had to remember to continue holding the foot, wait for a moment where she was quiet again, and then put the foot down and back off, even though I wasn't done yet.
Then ask her to lift it again after a minute or so. Not touch it, let her stay still, and reward her by putting it back down over and over.
Be careful with the bath that you aren't teaching her inadvertently that throwing a fit will get what she wants (you to stop and deal with the fit) and holding still will get her what she doesn't want, (more bath).
If she holds still for even a moment, back away and let her stand for a second without pressure, then go again. If she gets agitated, keep bathing until she gives a hint of holding still, then back away. Eventually she'll learn that holding still will lead to the water stopping.
Good luck, and I hope you find someone to help.