throttle body sticking on Camry 2000

Hi everyone I find that lately my gas pedal "sticks" a little bit when beginning to press slightly on it to move from idle. My diagnosis after some investigation is that the throttle body is sticking, not much but enough so I feel it. It is a bit annoying but otherwise the car functions nicely. I looked at all the linkage and found no problem. This "sticking" is rather felt while the engine is on and idling. The pedal works freely when the engine is off. My questions concern a) is my diagnosis correct, b) is the cleaning of the throttle body difficult. The car is a Camry 2000 CE 4 cylinders. Anyone with previous experience on the subject? Your comments would be really appreciated. Jean-Guy