Your first year you can't practice enough.........Definetly shoot from 20 ft if thats your stand height. Preferably actually shoot some out of your stand. Your probably shooting in a tee-shirt.........its may be hot but what will you be wearing in November......layers make it harder to draw your bow and if you have any clearance issues on your forearm you want to know now!

Practice everything and you will have great success!

Good Luck!