It's not nearly as complicated as it sounds to operate a pressure washer. In reality, it is nothing more than an electric motor driving a water pump. The washer draws regular water from a faucet (that's a tap to you guys in the UK), the pump forces the water to accelerate to a high pressure, and then the washer squirts the water out of a hose at a high rate of speed via a trigger gun.
If you are concerned about spending a significant amount of money on a pressure washers that does not come with any amenities, you should read the evaluation of the pressure washers that can be found in the pressure washers category on Best Tool Box. We will work to ensure that you do not come to regret your decision.