hp deskjet 815c how to disassemble to clean the mechanism

hi,
My hp deskjet 815c sometimes makes a cracking noise and destroys the
paper, which blocks inside the mechanism. I tried to open the printer
body, but don't know where to start not to damage the plastic parts.

2 torx screws successfully removed but now - no idea, which part
should go first.

thanks for help or any link.
greets,
np