# They spread out a net for my feet

"It is as though my enemies have spread a net out to trap me" or "They planned to capture me like people who spread out a net to trap an animal" 

# They dug a pit in front of me

"It is as though they dug a pit for me to fall into" or "They planned to capture me like people who dig a hole in the ground to trap an animal"

# They themselves have fallen into the middle of it

"They themselves fell into the pit they had dug for me" or "But they themselves were hurt by what they planned to do to me"