Effective control of oak wilt focuses on hygiene and sanitation. Systemic fungicides are used to control spread to susceptible trees around the periphery of a hotspot. The diagnostics, fungicide and application equipment is expensive enough to consider hiring it out, but probably within the realm of most of us.
The key thing is read the label, understand the label, use PPE, grok molar calcs when mixing, and sourcing the product. Its been a while since my CPA* license lapsed, well before Oak Wilt took root, but sale of fungicide in the concentrations needed for effective injection MAY be limited to licensed applicators.
Give Mr. Haney a call, down at the extension office. He'll know.
*certified pesticide applicator, no fooling