# When the wall was finished

"When we had finished the wall"

# I had set up the doors in place

"I and others hung the doors"

# the gatekeepers and singers and Levites had been appointed

"they assigned the gatekeepers and singers and Levites to their tasks" 

# gatekeepers

people responsible to control access to the city or temple

# singers

vocal musicians who led in worship, in processions, and ceremonies, producing music and chants