@Howie Dub I live in California, and purchased my 1500 in Colorado last summer. I didn’t have it shipped, so can’t help you there, but I can try to help with the steps of registering an out of state new vehicle in California.
First, theses trucks are 50-state compliant as far as emissions go. However, California will make you smog it in order to get it registered. You will also have to get it weighed at a certified scale and bring that documentation with you to the DMV.
There’s one DMV form (REG-343) you have to fill out. Once you take everything to the DMV they’ll also conduct an inspection of the vehicle (making sure the VIN matches, they’ll look under the hood at the emissions sticker, etc.)
When all said and done, it was a fairly easy and straightforward process. I did my homework ahead of time to see what all needed to be done so there weren’t any surprises. They only thing that sucked was having to spend pretty much an entire day at the DMV office to get this completed due to extremely long wait times due to COVID.