Lows and highs are the same process.
Twist a quarter turn, or so, to align the tabs with the cut out slots to enable them to fit out of the headlight housing, and pull them straigh back.. No need to remove the battery, or anything, for that matter. If you really need more space, there are three small screws that hold each headlight housing to the car.. two on top (either side) and on in the center, back, down low. Remove those three, and the housing is free, then you can maneuver the housing to an angle that you can reach the bulb itself.
When re-installing, don't touch the bulbs with your hands, or get them dirty.. wipe them off if you do.
Ray