Well the first wrong thing is that the snake is "aggressive". Snakes aren't aggressive, they are defensive. To them you look like a giant who is going to eat them or kill them. They are simply protecting themselves. An aggressive snake would be like a mamba who actually will chase you lol. My best advice is just go about doing daily stuff like changing water, spot cleaning, feeding etc. Then once the snake is eating good and feeling more comfortable, then you can work with earning trust.