Yes, the surgeon will (SHOULD!) carefully instruct you in its use.
Including how to deactivate it. That's important should you ever need a catheter. Careless catheter insertion can damage your urethra and/or AUS cuff.
Yes, mine is slippery like a greasy bean. But as you perfect your technique (as I did) over a short time you'll find a way to steady it.
I never even feel the tubes or reservoir, just the activation bulb.
Don't worry too much. Life will bet MUCH better for you.