Clogged air condition drain
 

Hi, I have a 2010 Mazda CX-9 and the drain hose is clogged atleast that's what I was told. I had several people tell me it can easily be unclogged yourself but I can't find a friend to do it for me. I talked to a mechanic and he said that the whole dash has to come off and is going to charge me $300. Anyone know if this is correct?
In videos it looks like you can go underneath!