We had originally asked the Scouts from the various levels of the dens if they had an issue with the girls being Scouts. We did not ask it as direct as that but their response was confusion. They could not understand why they were not already in the Pack. They saw the difference between Cub Scouts and Brownies/girl Scouts as "Cub Scout go camping, girl Scouts sell cookie" Not my works, Scouts honor.
We originally were going to have a girl den for all the girls called the Fox Den, we learn combining the ages did not work and we did not have enough girls or leaders to make separate girl dens at each level so we just put them in the mix.
We treated them the same as the boys, they did all the den activities and pack activities just like the boys. We encourage all parents to become leaders and we really encouraged the girl cubs parents to become leaders; some did. We already had/have female leaders so it was not a gender issue.
We were careful to not step on the toes of the girl scouts at our School so we never actively recruited, we just said we were open to youth 1st grade through 5th and no longer turned anyone away. We expect now to have many more
We camp often and it is family camping so the families are responsible for their own children and scouts do not share tents so we did nothing different at campouts either.
Even things like the buddy system were the same unless they were walking to the bathroom or showers then it either had to be two girls or an adult with a girl and boy. In our Pack of 100+ Scouts we have only had a few girls each year so far - we did not seek them we just did not turn them away.
We would award them patches and rank patches etc. The only issue we had was uniforms. We had a tie dye shirt made, intending it to be for the girls only, well all the Scouts wanted them so everyone has a tie-dye class B and the girls still have no uniform. We were always very open about everything we were doing, both to the council and especially the parents. The parents knew their child was not full BSA members so there was some dissatisfaction from the parents - not toward us but council. That issue should be gone very soon too now.
We stumbled into allowing girls a few years ago when a girl came up with one of our scouts and asked if she could join, we though she was his sister so we said yes you can come to everything your brother does. She said no, I'm his friend. We said yes and decided to see how it went. It was much easier than we ever thought it would be.
There were no issues with the girls doing the program, there were no issues between the boys and girls. I think the younger scouts are easy the boy scout age will be much more difficult but I think still easier than people think.