how to get heater stuff from under dash

I want to take out all that heater core , blower fan etc from under the dash, I cant see how to get it out? I removed the bolts from the other side of the firewall but it wouldent give. Any advice? Also the motor for the windshield wipers and the blower motor on the outside of the firewall. I unbolted both and they are loose but attached by something inside.

much thanks!