ditto everything Aculady and Grinity say. An evaluation will give you important information/understanding of what is creating the barrier. HWOT is a great program and one of the interventions that the evaluator most likely will recommend.
You are wise to be concerned - poor handwriting can cause havoc in many seemingly unrelated areas - note taking/study skills, math. Accommodations may help, but it is important that your child develop some fluency. Sometimes there is just no getting around handwriting.
