AC fails to cool. Rigid line leading freezes - becomes hot

What is your question?

Rigid line leading from dryer forward freezes to connection point on sidewall where line is hot. I suspect plugged line (orifice filter?) but unsure of how to disgnose this correctly. I am on a very restricted budget and must perform the work myself. Being female, I fear this job is over my head. Any suggestions? By the by, I have some mechanic experience, but on a jet. . . Working on cars scares the crap out of me!