Replacing lead bend on 2nd floor toilet 1920 house. FUn FUN FUN!!

[Chris Masons]

How much of a nightmare will this be? LOL  I plan on hiring this out, but just curious if anyone has paid a Plumber to do this work and at what cost? Lead bend connects to old CI stack,

House was buit in 1920, very old and original piping. I Am going to need to open up first floor bathroom sheetrocked ceiling to gain access to the pipes.

I am sure this will be very tight and will be a major PITA.

Anyone have any experience in this job?

thx in advanace,

Chris