Like many here, the "easy way" for me is to just have the inverter feed the entire electrical panel and then I can choose what to power from the inverter. I have to be selective about load shedding, obviously, to avoid overloading the inverter. Like Brian E., I also have an automatic transfer switch in my inverter that switches between inverter power and incoming AC (shore or genset). Works great.
It's my wife that can't seem to "get" that you can't run the toaster, the microwave, and the coffee pot at the same time on our 2500watt unit. She even started up the A/C on it one day! Luckily, I was there and started the genset before she drew down the house bank to dangerous levels. "I just want it to be easy!" she says.
Hmmm.... And I thought it was!