What I do, after a brief 'warm up' period......
1) Undo and remove the oil drain plug - left lower front side of the engine (beside the oil filter cover)
Allow to drain completely. Be careful not to let it drop into your drain pan, Also, there is a washer on the drain plug - don't loose it either.
2) undo the oil filter cover slowly. once free, remove carefully - there is a sping, washer, and of course the filter inside.
3) allow the engine to drain completely - this is usually quicker if you've warmed the engine up, slower if it's a cold engine.
4) replace the drain plug - be careful not to over tighten - I've seen the front engine cover 'crack' due to being over tightened.
5) Replace o-rings in filter cover Large on the face that attaches to engine, and small one on the Bolt/filter pipe - near the
top of the filter cover. You will see it if you've completely disassembled the filter cover from the bolt.
(pic of bolt/filter pipe)
6) Reassemble the cover - Place bolt (with new o-ring) through cover... put spring onto shaft, then washer, then filter
7) screw filter assembly back onto engine, and tighten according to spec.
8) refill engine with oil through the hole where the dipstick is - have 4 litres (quarts) ready, but you will likely need only 3 and then some.
9) Once you have put in 3 litres, replace the dipstick, and run the engine. This will make sure that the filter has been 're-filled' with oil.
10) Stop the engine, and recheck the oil level. Do this, as mentioned above - remove the dipstick, dry it off, then re-insert it without turning it. Do NOT thread it in. The proper measure is with the dipstick just sitting in the hole.
Add more oil as required until it is above the 'bottom line', but below the 'full line'. (there is a cross hatched pattern between the top and bottom lines)