The Lord counseled the Seventy to pray, when entering a house say "peace be to this house," don't go from hose to house, eat what you are given, heal the sick, preach, if you aren't received in a city preach in the streets, they will have power from the Savior, and be blessed.
Now we still send missionaries in pairs to preach and the work is a lot but the people doing the work is few compared to what needs to be done. Our missionaries heal the sick and preach to the people of the city they are sent to. Our missionaries are given power over the enemy.
I wasn't able to find Seventy on the church website, I just found scriptures.