I'm in the process of making a tutorial for this. It probably takes about 1.5 hours to change the speakers if you're handy with a wrench. It's a total pain in the ass, but there's nothing difficult - just tedium.
My advice: Do not bother just to replace them with the stock speakers - and definitely do two at a time. This is only worthwhile if you upgrade. (I got used stockers on the cheap from Morad and it still wasn't worth the effort to me.)
Also, at 1.5 hours, that guy is asking for $100/hour.That install had better come with a happy ending.
And you can definitely find a better speaker at $129.
Quick and Dirty:
1. There's two T-shaped handles under each seat where your balls would sit. Pull those. Harder. Your rear seat will pop out. Remove it.
**Pro Tip: You'll find approximately $0.82 and an entire box of crackers. Keep the money, the crackers can be discarded as they are a 30,000 mile part and have been dragging down your 1/4 mile times.
2. There's a 15mm? bolt on the door-side edge of the hinge on both seat panels. You'll have to squeeze it past some cushion. Jiggle your panels out.
3. The bottom of the seat frame is held down with three 18mm? nuts and two 18mm? bolts. The bolts will require your Man Hand for removal.
4. The top of the frame is held on by four 10mm bolts. Piece of cake.
5. Remove the seat belts from the bottom of the frame with some serious jiggling. Might help to use a flat head screwdriver or loud yelling.
6. Pop out the frame, being careful not to break the plastic at the top.
7. Fold all the seatbelts through the slits in the upper desk tso that they lay behind it.
8. The carpet-coated cardboard deck is held in by two big plastic railroad spikes right under the seatbelt holes you need to pull out. Yell at them, too.
9. Carefully remove the deck. Try not to crack your speaker grills - they're ironically fragile. Also, don't lean on the compass thing in front of your amp.
**Pro Tip: Have a vacuum cleaner handy for the three hundred dead bees you find.
10. Your speakers are held in by two plastic tabs each. You can figure that out for yourself if you got this far.
11. Use a flat head screwdriver, roofing nail, or prison shank to un-clip the speaker wires from the speaker.
12. Swap speakers.
13. *****TEST SPEAKERS BEFORE RE-ASSEMBLY OF SEATS******
14. Re-assemble seats.
