Yesterday my brother and I got our Guild Hall. We were only 2 and even after we wiped at the Knight we got back in and made it with 1 min on the clock.
So it is possible to make it with only 2 people. My brother was on his bersi tempest and I on my sinister condi engi.
We used blinds and los while focusing the vinetenders and the maw. We tried to pull the knight around a pillar while dpsing him.
Is the guild hall too expensive for 2 people? Yes!
Is it to hard to get? No!
p.s sorry for my bad english