I got married last year. There are a couple of instructors around Munster and luckily my parents knew a doctor who had training in that area so we met her twice, but TBH by that stage she pretty much just confirmed what I already knew.
Now, I know they say you shouldn’t self-teach NFP, but the book “Taking Charge of Your Fertility” by Toni Weschler is absolutely amazing. It’s actually a FAM book, so just ignore the parts where it mentions condoms

The book teaches the STM method and is well worth buying even if you go with Lady Comp, because you will be so educated about reproductive health even from just flicking through it.
Also (and this is my personal opinion so take with a grain of salt), it’s well worth practicing STM or a mucus-only method of NFP in conjunction with Lady Comp, because the knowledge gained from NFP is so empowering for a woman and observance of natural symptoms (even if you aren’t relying on them for NFP) will teach a woman so much about her body. The Lady Comp does a lot of that work for you and there might be a tendency to not rely on your own abilities if you ever found you couldn’t use it for a time. But I’ve never used a Lady Comp, so take that with a grain of salt, as I said.
However, it does take months to get used to any method of NFP. I would say 3-6 months, bordering on the 6 months unless one is lucky enough to have textbook cycles.