Hi and welcome.
Your clutch cable could just be worn on the inside. The lining is teflon and the cable can and will wear a groove into the teflon. If the clutch is heavy at all, with no other symptoms, then this is your best bet.
As for the speakers. You need a very short screw driver. I replaced mine with Alpine units that come in two pieces. The tweater is separate from the main speaker and fits under the window where as the main speaker fits in the door panels. If you have the fold out pockets in the door panels, don't worry. A decent car hifi shop will have replacement speaker covers. Just remove the fold out pockets and fit your speakers. They are designed for the car. You then just need to route your speaker cables down into the door cards via the cable boot in the door shut, connect up and bingo.