I am installing my components myself

I would like any advice that you might have on installing components.  I hear people talking about angle or anything else someone with no experience might need to know.

you can try positioning the tweeters anywhere in the car, put some double sided tape on the back of them and experiment. try to keep them no farther than 6inches from the midranges. if you dont, reverse the tweeters phase if they not close to the mids. best case scenario, put them in kick panels

Why would you wire them out of phase if they are more than 6 inches apart? Im guessing so that it hits your ears the same time that the woofers do. What about when you're wiring it to a crossover, and you have the option to attenuate the tweeters 3 or 6 db by wiring the negative to a different terminal on the crossover? Can you still wire them out of phase?