When changing your oil, don't warm up the bike too much. Otherwise, you burn your fingers when you take the drain bolt off. Don't fumble the drain bolt and drop into the collection container, Don't use a collection container that has holes that are just large enough to let the drain bolt fall in, but make it impossible to get back out.
Make sure that you have a clean filter handy to replace the dirty filter, or another form of transportation, before you drain the oil. Otherwise, you have to either put the old oil back in or put the new oil in with the old filter so you can get to the store to buy the proper filter.
And, tighten the oil filter by hand instead of using an oil filter wrench. Otherwise, you will need two big guys using a wrecking bar for leverage to get it off.
Don't ask how I learned all these lessons.