Bassoonists: Do you use a hand rest when playing?

I use a seat strap, and I find that my left hand tends to slip/move and get tired. I have heard about hand support when playing bassoon and I have a hand rest, I just dont know where to put it or how to use it. My hand could be getting tired just because I am somewhat small and I am not completely used to the instrument yet.I have been playing for about a month, so that explains my ignorance about hand rests!