It's been a while but if I remember right you take off the grill covers, remove the screws, take off the lower and upper parts of the speaker and I think the tweeter is screwed into the upper piece from the back. The tweeter wires only go on one way and since you are replacing the tweeters you really don't have to worry about damage. Also, the tweeter wires each have different connectors so you can't hook them up wrong. Just grab some pliers if you have trouble. Don't stress, it's really eazy once you get started.
Gary