I'm planning on installing 2 12" subs, 4 upgraded door speakers, and a new head unit in a 99 Accord.

I successfully installed 2 12" subs, an amp and hard wired a JVC head unit into an MKIV Jetta so I'm pretty confident that I can do the Accord set up with ease.

The only thing I haven't done is changing door speakers. After installing my own setup on my Jetta, I feel like taking on the Accord wouldn't be a problem.

However, when changing door speakers, I would assume it's fairly easy. Just take out the old, put in the new, and wire it up appropriately? There's probably 2 wires like all speakers that I would just plug into the new speaker?

 

"I would assume it's fairly easy." That kind of depends on the size of the speakers and if you got a set of speaker lead adapters. 94

 

Do you know which wires are + and which are -?

Buy a dynamat door speaker kit. Also some metal tapping screws and some speaker terminals.

As far as the subs go, I've seen many amateur installs that "work" but they were total crap and in many occassions the car was a fire hazard. At the very least, the setup was suboptimal. Hopefully you've had some form of training/experience, read a book, or at least looked over some pro installs carefully or witnessed the install.