Double post but for a good reason:
dont get the last perk in the archery skill tree, (15% chance of paralyzing the target for a few seconds) It causes more problems then anything. You'll be sniping a dude from really far (or even across the room) and he/she will just stiffen up and fall over while takering no damage. You'll have to wait for him/her to get up thus giving away your position, or walk over and finnish him/her off. Kinda takes the fun outta being all sneaky and picking people off one by one from a far.