concur with the consensus on both points:
as to the carving, your most valuable tool is the eraser, followed by the pencil on the other end. then the strop, the stones and then the chisels. money spent in the purchase or rental (i like to buy, so i can view at my convenience) is not really "spent," but rather "wisely invested." think of the expensive stocks you don't ruin and the time you don't waste as the instructor tells you "... if you do it this way, you'll mess up for sure, so take the chisel and ... "
i really like the idea of practice pieces- i used most of mine for kindling. if you're a congenital cheapskate (as i am) go to the wood pile and pile out some hardwood (maple, ash of maybe beech is you can find them) and spend some quality time with a belt sander, creating something which approximates the curve of the back of a stock. smooth it out a bit, carve away, mess up if you're so inclined, re-smooth with Mr Belt Sander, and go again.
as regards the rifle too pretty to hunt with, i know of no such gun; not to say that there aren't true works of art, but they're too shiny to take to the woods- you'd spook the game.
my Grandpa's brothers rifle sits next to me in the corner, awaiting a scope mount to repair the one botched up by my dad when he was twelve. my eldest daughter (now 26) asked if she could use it, to which i replied "Well, when i'm dead i probably won't use it much, but not 'till then."
"Mommy, Daddy won't share with me!"
(but then again, the rifle is pretty well covered with the patina of generations of use)
keep us with the carving- the work is well worth the result.