Hey I'm new to the forum and car audio in general.
I have a 2005 Cavalier.
I want to install a Boston SPZ60 Component system.
I know it would be better to leave something like this to a professional but I am pretty stubborn and really want to do it myself.

Ideally I would like step by step instructions but any answers to my following questions would be much appreciated.

I know I have to increase the space in the door to mount the speakers.
How do I do this, tin snips ?

What is the best way to set up the crossovers and the amp ?

Will the crossovers fit in my door panel ?

What is the best place to hide the wires running to the amp ?

What amp/sub is recommend to use with this system keeping cost in mind ?

Any do's don'ts tricks and tips anyone can suggest would be awesome.

I'm super new to all of this and understand that a response would take a little while to write, so I thank anyone who is willing to help in advance. The only way to learn is to ask.

Thanks !!