ive always done my own, and my mothers, my brothers, my friends, etc., i started changing oil on my dads car for him when i was 8, then i worked at a lube shop when i was a teenager, it just got easier over the years, plus ive seen lube tech's bust the grease seals on suspension and steering joints, a big no-no in my book,.... suffice to say, the only ppl i trust to change my oil and lube my chassis are myself, my father, and my son after i show him the ropes
edit: good rule of thumb- hot oil drains 60% quicker than cold oil, let your car run for 10 minutes b4 you change, that is if ya'll can tolerate the heat like i do