In over my head?

I decided since I seemed to be on a roll with the main bathroom that I would start the demolition on the ensuite bathroom.  My mom had made the good suggestion that I should start now just in case anything needed to dry out.  I started with the hard part- the shower.

Looks innocent enough, right?

 I'm pretty sure that no amount of 'drying out' is going to help this shower!

Thankfully most of the studs appear to be sound but its shaping up to be a heck of a job...

I think there's a possibility that I'm in over my head with this one.