If you are friends or family friends with your local mechanic just take it to them; servicing a skyline is very easy but make sure you check up and learn what fluids go where so you can make sure the mechanic wont put in the wrong thing.
when it comes time for tuning, mods etc: take it to one of many SAU recommended places; racepace, creatd ms, re customs and status tuning being the best of the best.