You don't have to take the midrange driver out to replace the tweeter. The tweeter grill will "twist" off. Then if you gently push the aluminum loading tube from the back the tweeter will just fall out. You can unhook the connections (noting which color is + and which is -), Reconnect the new tweeter and put (twist) the grill back on. It is that simple. The problem with taking the midrange out is that you need some special tools.
Hope this helps.