I mapped mine but I'm not an electrician. I just plugged a small led light into one of the outlet holes in each outlet and put the light to the "on" position. I also left all the wall switches to the "on" position so all the ceiling/table lights would stay on.
Then I switched off one breaker at a time and went around the house to see what outlets/switches turned off. I wrote the number of the breaker that was switched off and what turned off in the house. Once I completed my search I turned the breaker back on and went to the next one.
Just make sure the AC/Heat, oven, fridge, dryer and water heater are on their own breakers. Most of those will be on 40 amp circuits or higher by themselves. This will be where you can find out how many amps you need to run the house smoothly. Most older homes are 150 amps but newer ones I believe are 200.
Might take you an hour but worth the time to be sure