Expansion site: https://www.guildwars2.com/en/secrets-of-the-obscure/
Trailer: Click Here
Announce Blog: Click Here
Combat Updates: Click Here
Story, Mastery and more updates: Click Here
ThatShaman Countdown: Click Here
After the Dragon Cycle - Guild Wars 2 News: Click Here
First Contact: The Kryptis and Rift Hunting: Click Here
If it makes you feel any better, HoT is the hardest one, and the newer expacs are (reletively) easier than HoT
I had played hot way back when it was released so I already got all the necessary mastery points. I was surprised how short the story of the game is.
Started now with LWS3 and will continue it after i return from my honeymoon vacation !