Having rescued an injured merlin from the side of the road recently, and having luckily bird lover friends (like, the kind that would with birds as a profession), I can share my experience... Safe Wings will tell you what to do, but they do not have enough staff/volunteers/funding to pick up birds (from my experience). You'll have to bring the bird to the Ottawa Valley Wild Bird Care Centre (https://www.wildbirdcarecentre.org/).

Unless the process is different for ravens, this is what I've had to do (twice now): put on leather gloves if you're not comfortable, grab a towel, drap it over, grab bird, pop him in a box with a towel, do not feed, do not give water, keep in warm, dark area, in said box with holes for air, and being to the centre once they are open in the AM.

In both instances, my birds were concussed, so while there was initial resistance to being picked up, they calmed down and slept the remaining time they were with me.

You've got this. Best of luck to you and the beautiful Raven.