For those of you inclined to doing auto repairs, research safety practices for doing repairs first (examples: always use jack stands beyond needed capacities instead of using concrete blocks or other brittle materials, pull wrenches toward you instead of pushing away whenever possible, while avoiding pulling toward face or head, use two hands whenever possible, torque to specified torque specs for whatever fasteners torque specs can be found for, etc.).
Research the Web—mostly discussion boards—for common parts failures and repair procedures for your particular vehicle. Bookmark pages of particular interest. And yes, we are capable of replacing vehicle computers when needed and so on. And no, computers aren’t needed for repairs. There are diagnostic routines that require nothing more sophisticated than a VOM (volt-ohm meter, analog’s fine, or even a cheap digital in most cases). Be careful around fuels. Read all about safety that you can find. Don’t be afraid to ask questions of the do-it-yourself grease monkeys using the discussion boards, and be humble.
If I may add, regarding do-it-yourself auto work, online stores often have better prices for parts that autozone, advance, etc., which you can also look up online for price comparison. Additionally, some online parts suppliers (1A Auto is one that I know of) have tutorial videos on performing some of the work. I thought that was smart of them. Sell the part and show how to replace it.