No need to drop the tank or drain it since the replacement is done entirely through the top hatch in the trunk. It would help to run the car so that fuel is below 50% though. And for goodness sake, don't smoke or cause sparks. Now is your time to treat the top of the new unit with POR-15 rust preventive. Make sure you review the FAQ instructions on removing the various hoses and fittings as well as installing new hose clamps since the old ones will certainly be rusted solid. If you have a tough time removing an old clamp, try cutting it with aviation snips or gently slicing it with a hacksaw blade, being careful not to create sparks. The fuel output is a quick disconnect that requires squeezing between thumb and forefingers while pulling. Installation involves some twisting of the unit while the pickup is compressed using a string so you can maneuver it into place.