...but teaching someone to finish it good, consistently, is the kicker.
^ agreed...even in the past 5 years so many how-to vids have come up that are extremely detailed. There isn't much you can't find on there these days.
FWIW, I like to consider a few things when choosing whether or not to do a job--how much time (and maybe frustration) will this job take me, and how much would it cost to have someone else do it professionally? There's a balance somewhere in there that could tip it either way (it'll probably depend on how much money the person has, how much they make...the "time-value" of money), and that's what I tend to base my decisions off of. You could also add in..."will I have to buy another tool to do this job, and how likely am I to need this tool to do another job in the future?"