Good questions, don't assume and ATC makes mistakes
low time pilot question . . .
the controller said "resume own navigation". He did NOT say "radar service terminated" or "squawk VFR".
Am I correct to assume that the controller was still giving me radar service and that I was cleared through SNA's airspace?
When in doubt ask.
OWN NAV means just that, no hidden meaning. ATC often gives vectors, mostly with IFR and when you transition for vectors to OWN NAV they tell you that. You are free to navigate. HOWEVER EVEN IF VECTORED YOU ARE RESPONSIBLE. IF YOU GET A BAD VECTOR, AND FLY INTO A HILL OR AIRSPACE YOU ARE NOT ALLOWED IN, ITS YOUR FAULT.
I can't tell you enough as PIC you are in charge of the plane and responsible 100% of the time. I only say that because pilots trust ATC and some times get themselves into pickles. ATC v pilot is NOT and adversarial relationship, but you have to realize to be blunt if you crash they still go home. If you screw up its your you know what in a vice. If you blow or ignore an ATC command than they get mad. They assume you understand and will comply.
If there is "airspace", B, C or D and you don't ear the words "cleared to enter the blaa blaa", than don't assume. If they forget fine but ask.
Usually they cut you loose from VFR flight following so you can switch freqs, get atis and tower and land. Many are pilots and know its time for you to start your initial arrival and get ready. The fact he kept you on a discrete squawk means he was probably keeping an eye on you, BUT DONT ASSUME. IFR they usually hold your hand to the initial approach segment or the STAR.
Regardless when you do get VFR flight following you have to play the game, listen and do what they say, but the are only watching and can give you vectors or traffic, but don't assume or count on it. If say I'm on an IFR flight plane and in radar coverage, I still have to fly the plane and navigate.
The controller in the group can give you their take, but as a pilot I can tell you controller MAKE MISTAKES ALL THE TIME, and they'd be the first to admit it. I don't mean one controller, but ATC system wide mistakes are made. It is the check and balance between pilot/controller that is the safety net. Pilots of course make mistakes as well, but the law is PIC is responsible.
In this case all sounds normal and if you are low time, say "I'm a new pilot".
VFR flight following is a service, as time pirmits. Don't expect traffic call outs; that is STILL your responsibility; don't expect 100% navigation is taken care of. Good question.
Now lets say ATC has time and can hold your hand or stay with you to the airport, they might if you ask. They can give you vectors and even call the tower (on a phone) and give you WX. I have done it.
True Story alert:
Flying into Las Vegas VFR, night in a RV-4 was quite the light show. Approach told me airport at XYZ. I was landing at McCarran. I said I don't see it. No problem coming in for the NW he just gave me a progressive (fly down the strip) and after the 2nd or 3rd time he said, do you have it? I said yes and he let me go, "contact tower xyz good night". Ego checked but better than the alternative. Now before you guys question my MrkIV eye balls; there are a heck of a lot of lights in Vegas. Also it was turbulaaaaaant! My head was hitting the canopy. It did not smooth out till I was well into the valley. It's hard to see when bouncing. Bottom line I did not WISH I could see it. I was honest and a little embarrassed to not see it sooner, but heck I was glad to see I was on a perfect extend right base for the active GA runway 19R, tower was expecting me and I landed. The airliners where landing 25's I recall. It was so slick. Executive was right at the end, parked, got a ride to the hotel and checked in less than 30 mins of landing. I was having a drink and watching a comedy show an hour later. It was an impromptu stop and lay over. I was going to PHX but it was just too late and I was tired. Of course you have to buy gas but an RV does not take much and this is when 100LL was $1.98.