There is nothing to mess up on the face of the grilles unless you slip up w/ the torx driver while removing them from the dash. In which case, the baskets you're looking at won't help either.
All mods were done, in my case, to the basket that contains the original speaker (it's one big molded piece). Once you remove the whole assembly from the dash, you remove the 3 screws holding the basket/speaker to the back side of the grill (see green arrows below).
Then, just modify the "basket" by cutting out the original speaker from it but keeping the ring w/ the screw holes to hold your new speakers. Secure new speaker to ring (hot glue, velcro, epoxy, etc. Then just reattach it to the grill using the 3 screws.
Modify wiring in the dash by cutting off plug and replacing w/ appropriate sized female terminal connectors to match your new speaker. Reassemble all into dash and you're done.