It could be a few things you might need to grease the gears down at the bell housing, You might need a new clutch, or there's a lot of play on the pedal there's a screw on the top of the pedal or around it that should help with it.
Sounds like the clutch is not releasing. If it has a hydraulic release system there may be air in the fluid.
try to make sure the clutch pedal is all the way down before you change gear. in no way shape or form should you have to floor the clutch everytime you shift gears, however, if you are still grinding gears while flooring the clutch, and if there isn't that little bit of give on the pedal i'd suggest adjusting or replacing the clutch.
Gear knobs are mainly used to change gears whilst driving, which is normally done using the clutch pedal and pressing down to the floor whilst changing gears using the knob.
You use the clutch to change gears or stop. Not necessary when slowing down.
You may need a new clutch.
read the instruction manual in the book. or hold the clutch button down while u change gears. pretty simple
For first gear, Hold the clutch, press the gear down, accelerate slowly and leave the clutch gradually... For the rest of the gears, hold clutch, press the gear down accelerate a little more than the current moving speed and leave the clutch a little faster than before...
Down is 1st, up is 2nd to 5th and between 1st and 2nd is neutral. (I hope you didn't mean clutch plates).
You have a broken clutch.
clutch needs adjustment.
No, it will not wear the clutch faster That is a VERY unsafe driving practice. By putting the car's transmission into neutral, while going down a hill, you are now relying 100 percent on the car's brakes to slow and stop the car. This is very dangerous. The much safer way to do this is..........downshift to second gear and use the engine and the gears to slow down, while "covering the brake pedal" with your left foot, in case you need to stop rapidly. With a manual transmission, when you put it in neutral, you have dis-connected the engine from the drive wheels. The clutch pedal and the clutch plate are the parts that allow you to change gears without grinding them. Excessive clutch plate wear comes from "riding the clutch pedal" with your left foot, while driving along. Doing that partially engages the clutch plate, and makes it wear out rapidly. You should take your left foot completely OFF the clutch pedal when NOT shifting gears, and place it on the floor, away from the pedal.
When you are shifting gears, your RPMs will go down because your clutch is being pressed. If your RPMs don't go back up when you release your clutch, you should see a mechanic.
You have a bad or clogged slave or clutch master cylinder