To see if you have dash tweeters, or just fake inserts, get a torch and then get your head down next to the accelerator peddle and have a look. No need to remove anything
Here, you can see my fake plastic tweeter, without any wiring, as the Dini has co-axials in the doors
***some cars actualy have the fake tweeters, but actualy have the wires clipped into the connector***
If you have the wiring, then fitting the pioneers would only require popping the covers off the tweerers and undoing the bottom of the door trim, then unplugging and connecting the wires. Probably worth while having a go yourself