Short answer: yes.
Try to match your arrows to the bow, too. About 10 grains of arrow weight for every Lb. of draw weight (42 lb draw = 420 grain arrows). Then, get your broadheads so sharp you have nightmares of them slicing you up like a ripe tomato. Lastly, shoot those broadhead mounted arrows into hay bales or other appropriate targets to make sure they still fly good and straight.
If you can keep all your arrows in a 6" paperplate at your chosen range there is no reason you should not be able to humanely take a deer. And when it comes to practicing...remember, it's only the first arrow you shoot that really counts. Deer rarely let you fire a couple practice shots.