ParkTool has an excellent bike repair resource library. It is a great reference for the DIYer to learn and apply the numerous techniques while maintaining your bike(s). Check it out and gain more confidence tackling an array of tasks which are easier than you may think.
You can also purchase the Big Blue Book of Bicycle Repair and keep it on your bench as a quick reference. The book can also handle grease stains better than your keyboard when you run into a problem and need a quick answer.