You definitely don't need to remove the grip to get things reset, but you may need to remove the thumb safety, hammer sear and disconnector and put everything back in from there.
Here is a pretty good step by step video. Also, watch over the video to verify your Sear spring is sitting correctly in the gun.
Here is a pretty good step by step video. Also, watch over the video to verify your Sear spring is sitting correctly in the gun.