The fluid itself is no more dangerous than motor oil or other oil types. As mentioned by others, it's the pressure that will hurt you. Imagine using a pressure washer to take a shower but holding the nozzle close to your skin. That will force water under your skin just as the oil can be forced under the skin by pressure in the lines. Just make sure the pressure in the lines is relieved first. When you disconnect the first line, do it slowly. I always wear a pair of heavy leather gloves just in case. And as someone else said, a pair of safety glasses if it shoots out at your face. I think that if you read the label on almost all petroleum products, they advise to limit skin contact. It's not like acid but can be absorbed by the skin over long periods of time. If you're worried about skin contact after disassembly, someone else mentioned rubber or surgical gloves. They work good and keep you hands clean. Have fun with the hoe. Nothing to worry about... just some precautions.