Skyrim Creation Kit: Adding Perk Ranks and New Perks to Skill Trees

Creation Kit tutorial on how to add new ranks and adjust trees for new perks. *addendum* certain perk entry conditions require you to check that the player does not have a higher rank of a perk to proc the right effect. Bullseye needs check hasperk on Rank2 == 0, Rank2 needs check hasperk Rank3 == 0.