there may be easier and less messy ways, but the way I do it is, 2 hoses on bottom of resovoir, one is fluid return, other is fluid out. Place towel under resovoir, unhook return hose, (dont ask me which one is which ?) need to plug up hose connector on bottom resovoir immediately to stop it draining, use same diameter piece of hose with tight bolt in other end. I then extend this return hose with another piece of hose and a hose connector so you can feed it into a waste container. get new fluid ready, have mate turn on engine and make sure resovoir starts draining, if not then you prob have wrong hose, once nearly empty start filling resovoir, keeping a good fluid level, have mate turn wheel side to side a few times. Once drained fluid colour changes to new fluid, stop, reconnect, check level. Go for drive, check level again.