Some people here report small golf ball size stones flushed.
One of mine was the same size as yours. I still keep it in my freezer.
I have never had any problems with my liver. I just decided to make this flush to improve my health and out of curiosity. This stone, it was the biggest of all of my stones ever, came out on my 7th flush almost painfully. Just a very little pain for half an hour or so in my liver area. Nothing else.
Just a little pain in my anus next morning when it came out.
So my advise would be to do the flush. Keeping diet, as Blueduck suggests, is also good. You can drink fresh apple juice for a week or so before flushing. It suppose to delute you stones a little. You can find more information about it in other posts here.
Don't do the surgery! Spend more time on reading posts here.