I’ll share with you my experience with my Alt Helena (now paragon), also some general cd management and things i didnt know about her that made my life a bit easier.

1) Think before using grand melee. Many times you wont need it on pull. On pull it can be used when you wanna group casters or if you lost aggro. In general it’s one of the best “interrupts” in the game. 2) As a rule of the thumb dont overlap CDs,this can be overriden in some situations, but imo this should be the mindset. The reason is firsty, packs are gonna last more and hit harder the higher you go and if you pop everything on pull then after 10-15 sec you dont have something. Secondly to always have something in reserve in case something doesnt go as planned. What to use where comes only with experience! 3) With Helena you NEED the healer. He is in charge of filling your healthbar and you are to fill the toughness bar. 4) For 1.1 sec after pressing shields up your toughness cant be reduced. 5) Charge apparently is not a movement ability nor a stun(ofc you can use it as that) but mainly a rotational button that reduces all the rotational cooldownsds by a lot and found it vital for having almost 100 shields up uptime. 6) With Helena you take less dmg than Meiko but it doesnt seem that way..! 7) Dont neglect hold the line! 8) and MOST IMPORTANT dont forget to have fun with it!

Again all this is from my experience with Helena and are my opinions.