I third the request! haha
IMO, the single best thing you should do right now is replace the stock headunit with a quality aftermarket one. That will instantly give you better sound, and you'll have more control over the EQ and sound processing. You may find that you don't need to upgrade the speakers like you thought. Unless you are a true audiophile like me (it doesn't sound like it from your questions), it might be just enough. And you won't have to go tearing into your car to do it.
Replace the HU, then evaluate whether you need new speakers.
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