Re: Reassurance and your thoughts?
Kalina, you certainly can DIY and no matter how you learn, books and videos can help shorten the learning curve and broaden your knowledge. Having the PO take you out for some trips certainly should give you the basics.
Personally I'd still recommend a sailing school and some basic lessons, which tend to put things in perspective and should you the conventional ways of doing things. Sometimes just learning from "a guy" you will learn something that works for him, but is either wrong, or not the way everyone else will expect it to be done, and then you've got to unlearn it to get it right.
Besides, sailing school will put you in touch with other local sailors and should give you a good start on local contacts as well. Necessary? No, no more than a school "drivers education" program. But how many of us are self-taught at simply driving a car, either?