The first big "WOW!" moment post-HRT was definitely the discovery of soft, velvety skin from head to toe...and the increased erogenousness of it. I mean, I've always been easily aroused by most any touch, but with femme skin...omg OMG!
Ok, let's try to remember a freak out moment...when I came out for the first time to a non-management co-worker...I had about 3 seconds of PANIC!, then I was like, "Hey, do you want this or not? REALLY want it? Then let her know!" (c-w was a cis-F, whom I respected greatly)
"Hey, just wanted to let you be the first to know...I'll be changing my name to Beth as of tomorrow." She was ok with it (and not particularly surprised LOL) Other than that...not much freaking out.