I consider myself an advanced beginner knitter, and probably am not the one to answer this question, but I would try working the stitch back up with a crochet hook, but mentally prepare myself that I might have to frog back to that point if it didn't work. It's always a great thrill to take the chance and have it work out---and I've found great pleasure in finding I can rip back a couple of rows and find my place again.
(The first time I watched my friend helping another friend with a mistake and say,"Here...just rip out these rows" while yanking her yarn off the needles and unraveling, I nearly hyperventilated! But soon, I was doing it myself without a qualm. There's great peace in knowing you don't have to start over every time there's a mistake).