I think it is commendable that the OP has learned something about the 777 - we should not quash their enthusiasm and interest - many ATPL pilots I know are not very interested or knowledgeable about how the aircraft systems work.
But hopefully the OP realises that there is a lot more to flying than what might be gleaned from a desk-top home Sim; especially light aircraft. Flying a Cessna 152/172 in VMC is incredibly crude and basic, like driving a Mark 1 Landrover or a 1960's Mini - no offence to Cessna or those marques. But even so, there is a hell of a lot going on, and tasks keep coming at you relentlessly. It takes a while to get to the stage where you can assimilate what is going on, and then get ahead of the aircraft, which is where you need to be: 'What is going to happen next, and what do I need to set up next?'.
Best to keep quiet about your Sim and accept that you know very little about actual real flying; but do stay keen and open-minded to the training ahead of you. Good luck !