I'll 2nd what Lady Arwen posted.
Like the OP, I have always liked booking with Princess online, that way I can see every option & cabin, prices, and then make my own decisions, at my own pace!
I had the same questions/reservations about using a CVP years ago... but gave my booking to one who was helpful on the phone at some point, and while i still do my own research and then booking hold, I now contact my CVP and let him do the booking.
This has really paid off for us in our most recent pending cruise... our CVP has cheerfully re-fared us after final payment, ...moved cabins for us to assure we had adjoining balconys with relatives,... sent several nice emails advising us about our upcoming cruise.... including an in-person phone call to say thank you!
But the best was, just yesterday afternoon, after a month of 6 failed attempts via fax, then email and phone calls, online chat... to obtain my shareholder credit on our rapidly pending cruise... I finally CCed a 7th email to our CVP also, just to let him know in case he had any ideas...
And within an hour or so... got a response back, that he was going to look into it ! (... And his email reply was sent after 5pm!!!)
Even better yet, ...I then got another email from him about 10 minutes later, saying my shareholder credit was posted!!!
Checked my account & sure enough, it was there! (it wasn't an hour before!)
I'm impressed with that kind of service and care! Pretty impressive work, especially at the very end of most peoples work day!
And, now we are a little less stressed, since the said cruise is less than 2 weeks away!
I'm sure there are great TA's, ...infact we have met several on our cruises, that will do the same for you! And over the years, I had at least one CVP that was worse than a dud, so we had to call Princess and switch.
Either choice you make, with the right TA or CVP, will be great!
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