Yes, by statute, you have to report a change of address to DMV before ten days after moving.
Is it common to delay a transaction due to forgetting any prerequisite when going to the DMV office? what could be the alternative?
Yes. Around 10% of our customers forget some of the pre-requisites when going to a DMV office. To avoid this, you could check on the DMV website to see if you can do your transaction online.
What if the inquiry letter you send to me doesn't resolve the problem with my insurance?