What size are the bolts to remove throttle body? Also what is the best way to disconnect the accelerator and throttle cable from it without messing anything up? Or can the throttle body be removed without removing these cables?

 

I believe you need a 10 mm socket.

You can open the throttle with your hand and then the cable should come out through a slot.
Use Throttle Body Cleaner, not just any carb cleaner.

Here is a video on this topic. He works on a MPV but you can follow it.