Warmest welcome from all of us! Welcome to join the club!
By the sound of it, we are probably in the similar age group, my son is 2 and a half now, and I like to do maintenance on my own cars as well. I live a bit of north, I am in Canada.
Glad to share your joy, you reminded me my feeling with my Phaeton when I first got it, it is a truly amazing machine.
One thing I have to remind you is: Do you know if the transmission fluid has ever been changed? VW claim the ATF is filled for life, but the transmission manufacture ZF is saying the other way, and I had my ATF changed about 6 months ago, and I don't even watn to mention what I went through, if you do a search on this forum, including my posts, you will find tons of information.
Best luck and enjoy your Phaeton!