It's good to change oil regularly to keep engine wear under control. You should also change the oil filter when you change oil. Get together tools, rags and newspapers for spillages and if possible, raise the vehicle to have better access. The engine has to be warmed up before starting. Lift up the vehicle, put a drain pan under the drain plug, remove the plug and allow the old oil to run out. After that, clean and fix back the plug. Place a pan below the oil filter bracket; loosen it and pour its contents into your pan. Furthermore, detach the old filter from its location, cleanse the mounting place and attach a new one there. Finally, lower down the automobile, fill some fresh oil into its engine and verify if it has enough lubricant. Run it for some time to make sure that all parts have been oiled properly before checking its level again. Inspect for leaks again after changing your oil and keep on monitoring it for changes in quantity.