Revrico you can see at the top of the page that I swapped out the speaker myself, it isn't very difficult, but I don't know what skill level I'd put it at either, maybe I gifted .
I took a speaker out of an old centro and I had to modify it by soldering the pre's speaker's contacts to it, but if you bought a perfect match speaker for it then it would be even easier for you.
All you do is take the battery cover off remove the battery and remove the 6 tiny torx screws, then flip it over and get a fingernail or I used an Ipod repair plastic pry tool to get underneath the bottom of the keyboard bezel it snaps off at the bottom portion and once loosen you actually slide the 2 legs of the bezel out from under the top half of the slider. be careful that just the bezel is lifting up because the black keyboard film sometimes likes to try and follow as you begin to lift.
Now, after that is a little bit of a tricky part, you have to remove the volume rocker switch, looking inside where the battery sits and at the bottom of the rocker switch. you'll see a tiny hole poke something tiny in there gently! and that releases the little plastic rocker button. You'll notice the top of the rocker button has a tab that slides right out after you release the bottom. Now the switches themselves can be seen they're part of a flexible circuit that you lift off, out of the way when you're ready to remove the back section of the phone where the speaker is at. ( the volume switches do not come off with the back )
But one more thing before you pull to separate it, the antenna wires need disconnected you'll find them hidden underneath a removable metal lid located down under a black sticker overlay just to the left of the battery contacts and the touchstone contacts (backside of the i o p keys). The antenna connectors are small gold with black and white wires.
Now you can separate the back, just keep an eye on the volume switch, and walah! there's the speaker it just needs to be lifted out of the cavity.
To reassemble just get the back close and focus on the volume switch to have it coming out where it needs to be and not trapped, there is a notch and tab to make sure the volume switch is in location, and the plastic button for volume slides up and in at the top and snaps back into the bottom.
Then you can connect the antenna wires and lay the cover back over them.
When you get back to putting the keyboard bezel back on, get the top legs and leading edge started up under the slider and while keeping an even pressure across the entire top portion slide it under if done right look @left side and the right side legs should be nice and flush and only then do you finish snapping it in place.
And that's it
Hope this helps