If it would have been 1 black sacrament I would have certainly chosen it over capturing a resource, but 2 was a hard pass. Capturing a resource was very quickly done, but on a day where I don't feel like doing PvP even the 3 minutes it took were a stretch already, and I'd have much preferred to have some decent PvE choices alongside...

As far as how easy or difficult it is to complete a single Black Sacrament or Heist, if you're doing them just for the endeavor, want to complete them quickly, and don't care about how well you perform them, you can just race through them as though they were a delve or dungeon, killing anyone who gets in your way without trying to be stealthy.

As far as being able to complete 2 Black Sacraments or 2 Heists, there are 3 ways to do it:

(1) Ask zone chat if someone will share theirs with you. The quest changes twice a day (I think), so you may be able to do 2 different ones that way.

(2) Do them on 2 different characters.

(3) Easiest way [edit: to do it on one character without sharing quests]-- but takes planning-- is to accept and do them on a given day but wait until the next day to actually turn them in. Then you can accept and do them that next day but, again, don't turn them in until the day after that-- unless an endeavor that day is to complete 2 of them, in which case, go ahead and turn the second one in.