To the original poster: What bow do you have on order?
It seems like you're a bit concerned with having "only" a 40# bow. A lot will depend on the design of your bow. A good performing bow may well cast the same arrow faster than a lower performance heavier weight bow.
Just for example: I have a 67#@28" old Bear Polar. I draw 30", so at my draw it's like 72#. Now, no one would say that this bow would be too light to hunt with, more likely it would be deemed overkill.
I just finished up a r/d longbow that draws 48#@30". This bow will shoot the same 603 gr. arrow FASTER than the Polar, even though it is 24# lighter.
Notice I'm not talking same grains per # - I'm talking the exact same heavy arrow.
I'm not trying to start any arguments here, just offering the viewpoint that there is a lot more to a bow than just the draw weight. I'm guessing that since you stated you ordered a bow, it's probably a good performing bow and you have nothing to worry about - #40 is plenty.
It's all about good shot placement anyway - practice with it, keep your broadheads sharp, and go hunting.