Ash the trans filter/fluid is a diy if you have everything you need to enable you to get underneath it. You will need to remove the plugs to rotate the engine (use the bolt on the crank pulley) to get the torque converter drain plug into position for removal/replacement. Make sure you use the trusty old torque wrench when tightening everything up and you need to have a clean area to work in. Try to keep everything spotless.
'97 Honda CRV