Ive done it 4 times today in the space of 2 hours but i failed for 3 hours yesterday doing it.

How people should proceed:
Have a confident sword bearer that can call out when to shoot crota.
Make sure he is a hunter with blink strike so he can hit, drop sword blink invisible and hit him when he goes down again.

Other people in the party should all have gjallahorns (Makes it 10 times easier)
Titans should pop a bubble in the door so boomers dont shoot you and blessing of light is a must.

Helmets that let you regen health on orb pick up is also handy, if not use the suros or red death.

Stay up top by middle window when crota goes to middle and you should kill him in 3 swordbearers

If anyone needs any help ill be online tomorrow just give me a shout.

Crota becomes really easy when your with a good team just stick at it.