How to remove bank 1 (air fuel ratio) oxygen sensor wire connector

2004 Honda Accord LX 4 doors. I am going to replace Air Fuel Ration Oxygen Sensor or upstream bank 1 O2 sensor. I remove the old one from exhaust pipe, however, I cannot disconnect wire connector, I push the tab down the connector stuck in addition to, there is no much room to work around the wire connector. I do see there is a metal bracket mount on the engine . Google does not have info about this vehicle, most of cars are v6 or other models. Someone suggests to remove the metal bracket , but the other video shows from the under of the car. I try under the car there is no space. Please advise.