I've been in and out several times (4 ft. draft) and never had any problems just be aware of that "S" turn near shore. Be sure to follow the red marks in secession. There is one known "rock" in the channel just before the turn north but there is a BIG white sign with a red arrow pointing toward it. If you stay mid channel you'll be fine.
If you drive down to Sterling they generally have a handful of small charts showing you how to enter, Mike runs the office and Dennis takes care of the yard.
You start sailing with a bag full of luck and an empty bag of experience. The idea is to fill the bag of experience before you empty the bag of luck.