California assault weapons ban and moving to California

We aren’t fully committed to moving to California at this point but a lot of friends and fam are out there so we are looking into it. I was looking online and it looks like if you owned the firearm prior to the law going into effect it’s fine but I don’t see much info on moving into the state with firearms. Does anyone here have more information on it or information from personal experience? I’m going to continue looking into it but was curious if anyone here has experience with it. Oh, and concealed carry. I’m currently licensed in Oregon and Washington. Is it difficult to get licensed in California?

Thanks!