Do you think getting into the casino after the gala starts is too hard? If it wasn't, how did you get in so easily? I had to reload my save around 20-30 times and the last 4 times I set the difficulty to very easy.

Nonetheless, I still think Dead Money is the best DLC.

Mostly I simply sprint through the Ghost People. They are too slow for you. I only kill a few that may be blocking my way and keep going.

I thought it was a bit challenging, but not too hard. I just used the automatic rifle to take out the ghost people.