2005 Honda City clutch problem

Shakes or Wobbles problem
2005 Honda City Manual 65000 miles

there seems to be problem with the clutch of my honda. Everytime I pick up on the 1st gear, I have to press more race pedal otherwise there is vibration in the car. Also sometimes while driving at normal speed only, the car suddenly shakes while changing gears, may be coz of the clutch or the car is running at low speed on 4th or 5th gear. The clitch needs to be done I guess. I want to know if I continue driving like this without any repairs done, what harm is it going to make on the whole car.
the AC of the car is making little sound, ishowed it to some mechanic. He said it is fine, some internal bearing is making the noise which cannot be repaired. I shud use it as long as it is working fine. Shud I use it like this or any repair is possible of the kompressor.
someone suggested me I shud get the injectors cleaned as the car has run above 65000 kms. Is it beneficial or shud I pour the liquid in the petrol tank which serves the purpose.
what all is there in the clutch besides plates, bearing if whole of it needs to be done.
is there any way clutch can be adjusted.
please let me know of all the details for my knowledge.
thanks.