DIY bicycle wrenching might sound intimidating, but consider this: Having a few essential bike tools and the skills to perform basic maintenance will not only save you significant cash in the long run, but could also save you from a long walk home if you snap a chain or pop a spoke in the middle of nowhere.
There are a few basic bike tools that every cyclist should own, some aren’t even bike specific (ie: they can be found cheaply at a hardware store). Every cyclist should know how to lube a chain, fix a flat and properly clean a bike. In fact, a cleaned and degreased bike should be first on the list before a tool ever touches it.
The right tools will help you replace a chain, cables and housing, as well as adjust brakes, remove a cassette or straighten misaligned wheels. I suggest pairing this guide with a bicycle maintenance book such as The Big Blue Book of Bicycle Maintenance or the recently updated Zinn and the Art of Road Bike Maintenance and, if in doubt, always consult your local bike shop before attempting a hero move that could compromise your bike or result in more repairs.