It's an old debate that people tackle the wrong way: comes down to whether you wrench or not.
road-bike repair kit, which has since been changed and improved. I have something similar on three bikes at any time, and more durable tools at the house.
How much wrenching you have to do to be a 'cyclist' is a matter of debate, but riding lots of kilometres and not doing your own wrenching on your dentist-bike impresses me with a lack of curiosity and responsibility (hear that elder brother?). I am no pro, but have done some work: I have not replaced a headset, but have replaced two bottom brackets; I have not trued a wheel (without needing someone to fix it...), but have changed cogs, chainrings and cassettes; I have not built a wheel, but have repacked any number of hubs. 'A man's gotta know his limitations.'
I want to take another course than the eleven-hour Toronto School Board adult course I took, and will yet. Until then I can do 90% of my own work, and know enough about what I can't do to know who to pay to do it well. Certain pride in both what I can do, and know about what I can't.