Everyone has offered good advice.Work to become a better hunter and a better archer at the same time.Limit your shots to closer distances until you are making shots routinely and easily at those closer distances.Don't get discouraged even excellent archers withmany yearsof experience miss.They just don't do it very often.A rangefinder is a great idea if it is affordable to you.If you limit your shots to 20 to 25 yards initially a rangefinder isn't quite so critical.
Good luck!Relax as best you can and have fun!!You have a life time of learning ahead of you.