If it is like my Scion xB, there might be a plug at the bottom of the pan and a dipstick in the engine for easy drain/fills. I have done mine a few times, it is half the work of an oil change. Extremely easy.
Just find the capacity for a drain/fill on your model or empty the fluid into an empty catcher and then check how much fluid you removed before you refill.
But yeah, mine is easy... Drive up on ramps, remove plug... Let drain, replace the O-ring on the plug and secure the plug. Go up top and refill through the dipstick using a thin funnel however much was taken out. Do this 2-3 times after driving around inbetween or once a week for a few weeks or whatever and after 2-3 drain/fills a good amount of fluid will have been replaced.