Take a deep breath. The symphony of sound is going to drive you batcrazy for a while. But there is a fantastic abundance of information in all that sound that you will come to love if you tuff it out. I have seen more than one person prematurely sell his FBS machine because he couldn't (wouldn't?) make the transition from another machine. Despite my telling him that he was going to have a learning curve and begging him to stay with it for 50hours, 1 friend sold his ML and went back to the machine he was comfortable with (and make no mistake, he was Good with that machine).
Get Andy Sabisch's Safari book, of course. As a longtime detectorist, you may not get a lot from it, but you will glean a few nuggets and a-Ha items.
It took me about 50 hours on my Safari (my first fbs) before something went clik in my brain and my finds went way up and my trash went way down. This despite my having every advantage that the internet said was good for learning a FBS machine (musical experience, decades of detecting, intelligence, good hearing, etc).
Run Auto+3 until you get a feel for the machine; then force manual for whatever you can.
Cross Save and discriminate out the negative #s.
If you are going crazy, black out everything below about 38(depends on your soil) and 12,13,14(nickels). 15, even a jumpy 14-15 is a pulltab. period. Gold rings seem to be 3,6,9 and then from nickels on up depending on alloy.
The biggest thing is Trust Your Machine. Remember, the Safari is making that strange noise for a reason and its your part of the job to figure out why.
Welcome to the FBS Club. Youre gonna love it.