this is a messy job with out a lift. You basically remove the pan bolts ( be prepared to be drenched with trans fluid and let the car COOL down or you will be burnt ) After the pan is off, clean it up and replace the gasket and then reverse the process. if you can, get a rubber gasket rather than cork because the tend not to leak as much. Don't over tighten he bolts. 'Wrist tight' should do just fine.