My philosophy is "Be a pessimist. If everything turns to crap, it's no more than you expected. If it goes well, it's a pleasant surprise!"
Secondly, there is no such thing as a 10 minute job. You might think it's a 10 minute job, but by the time you factor in the "butfirstigottas", it can take half a day.
Example:
10 minute job: Change the oil in the lawn mower.
butfirstigotta clear out a spot in the garage - 1/2 hour
butfirstigotta scrape all the built-up grass off the bottom of the mower - which turns into an hour because you decided to wirebrush it and hit it with a coat of primer while you were under there.
butfirstigotta find my oil pan - which turns into another hour because you also found that 9/16ths wrench you lost a month ago and that inspires you to clean up the workbench cuz there's a couple of screwdrivers in there somewhere.
butfirstigotta go get some oil cuz I didn't realize I was out of 30wt. Trip to NAPA, and the wife says "Seeing as you're going to town, pick up a few things at the Shop 'n Save for me". Might as well get some beer while I'm in town too. Ran into Jim at the liquor locker, BS'd for a while then stopped by his house to check out his new shotgun.
butfirstigotta eat supper, I was a little late getting home.
Maybe tomorrow?