Comportment
SupaNewbie,
When I first started counting, I always worried about the PC's, dealers, and the EITS (Eye In The Sky: that is, surveillance). I wondered why they couldn't tell what I was doing... after all, it was readily apparent to me. Every time I sat down, I expected to get "The Tap", be escorted to the infamous "backroom", have my photo illegally published in the Griffin Book, and be barred for life for crushing the casinos with my massive $50 wagers.
Needless to say, my fears were completely overblown. The dealers could barely count their own hands, much less count the cards, and the PC's and EITS had much bigger fish to fry.
In fact, the only way I could have been thrown out at that stage would have been to make a complete jerk of myself at the tables. If you've spent any time playing live BJ, you know exactly the type of player I mean: loud, obnoxious, probably drunk, and abusive to the dealer, the other players, and the PC's.
My advice to you at the beginning of your career is simple: play the best game you can, and always, ALWAYS, be a gentleman (or a lady, as the case may be) at the tables. Chat amiably with your fellow players, the dealer, and the PC's, never whine about the bad cards, and especially don't blame the dealer for wiping out the table with her miracle 8-card 21 (I confess to having a bit of trouble with this one myself!). If you are pleasant at the tables, you will avoid attracting the attention of the PC's, who in turn will avoid calling the EITS for a "skills evaluation" of your play.
Of course, as stainless steel rat pointed out elsewhere in this thread, if your game is strong enough with time you'll eventually attract some unwanted attention, and the backoffs (or other "counter" measures) will come. My first one came after I'd been counting for about a year, on my second visit to a table that is a well-known "counter trap". Believe it or not, my world didn't end, nor did my BJ career... I'm still here, still playing, and still a welcome customer at most casinos.
Hope this helps!
Dog Hand