Reading comprehension is the best tool you can have. Honestly asses your level of automotive acumen and purchase some reading material. Don't really know a timing belt from a serpentine belt? Then start with one of the "dummies" or "complete Idiots" guides. No offense, these are well written books that create a general foundation of knowledge. From there you can source a repair manual for your make and model. Inside you will find recommended fluids and other important reference values for your car. Maintenance schedules, procedures and pictures to guide you. These manuals even assume an average level of ability and make recommendations on when to seek a specialist for difficult repairs. The "factory" shop manual may assume training and tools that only dealer trained mechanics have access to so these may be of limited use for us mere mortals. Armed with some book knowledge and a basic tool kit there are many simple tasks you can perform on your own to save some cash. Two bits of advice for you.
May take several attempts [Found in a Haynes manual]
A mans got to know his limits [Clint Eastwood movie line]

