Quick answers
Do I need to stay on the island while the house is for sale?
No. The house can usually be shown, inspected and appraised while you are at your main home. Signing needs you, and escrow tells you how each paper is signed.
How does the deed get signed if I live somewhere else?
A notary near your main home handles it, and California honors an acknowledgment made under that state's rules. Abroad, look to a U.S. consulate, or a local notary whose seal is then authenticated, for example with an apostille. Escrow lists the ID needed.
Can a notary do it online?
Not a California notary: California notaries cannot notarize online yet. For an out-of-state online notarization, escrow and the title company make the decision; check with them first.
Should a relative keep living there while it is listed?
It can work well: agree on when showings happen, how the house gets picked up before each one, and a firm move-out date. Empty is simpler for staging. A leased home is different: the tenant gets written notice before each showing, and California treats 24 hours as reasonable.
Who opens up for the inspector, appraiser and buyer's agent?
Whoever holds the keys, or a lockbox, usually covers it; ask Rudy which setup fits the house, and keep your own list of the contract dates.
Who should know the house is no longer my main home?
The insurance company first, then the Assessor if the homeowners' exemption still shows on the bill, USPS if mail still lands there, and any HOA.