If you wish to remove the gears remember not to loose any the of the shims (little washer looking things) unless you already know how to shim.

Hear is a guide for G&G AEG Shimming Guide Airsoft

If you have no reason for removing the trigger it is easiest to leave it in place. It can be tricky sometimes to get into place. However if you need remove it it can just simple be poled out.