Yeah, I've just used this site to learn about the products on the market today as I used to have a job in the car audio department at Circuit City.
And I don't have the money to have a professional shop install everything, so I'd be doing it. Running power wire, installing the speakers, HU, and amp, etc.
What equipment do you currently have or will be using? Your question is broad and requires a lot of answers. Installing may seem difficult for the first time but just take your time and do it right the first time and everything should go pretty easily.
Just get a harness for the HU, its plug and play, speakers are just some cutting then replacing, you do have to run the speaker wire to were ever the amp is gonna be, you need a power ground and a rem. power which comes from the HU to the amp as well with RCA's