I've just checked in JJ, and am delighted to read this.
Of course you're doing well. Just doing this at all is a good step forward.
I know it's been said before, but it's not a competition, and it's definitely not a race.
A lot of people would love to do what you're doing... if only they felt brave enough.
You want an F# ? Hold down the usual three keys on the left hand, and add just the middle finger of the right hand (usual place - just keep the other two fingers out of the way.
That's one of the many F#'s on a saxophone. Should be the same on a clarinet.
Keep going. It'll help keep your mind off your knee :o)))