pretty mush what everyone else said You willlearn as you go if and when somehting breaks or gets out of adjustment you fix it. Things most likley tohappen to me when I tour:
flat tires
out of true wheels
out of adjustment brakes and shiftrer cables
loosening up of head set
dirty chain
broken chain

I cary an extra brake and shifter cable a few spokes 2 tubes misc little screws and bolts a hand full of tools and some other stuff. Most every night i woudl look over the bike and stay ahead of potential problems but there is always something that will catch you off gaurd be as prepared as possible and learn the rest as needed.

If I took a day off in a town i would try to make a deal with a bike shop of auto gas station touse their cleaning tank and some space to work. I woudl disasemble tghe bike anc tank clean the entrie drive train and get it all lubed up and re adjusted a dn a good going over sometimes it would coast a few bucks to rent space and a stand and other times i could work a little to pay for the use and other times they just wanted to hear stories from the road in exchange,

So to answer your question if just knowing ghow to change a flat is good enough id say no but it is a start. i taught a bike maintenance class this wek to 10 people and only one had changed a flat before
catfish