fix mortar on party wall -- attic with insulation
I have an attic that has new blow-in insulation in it. The attic also has a party wall (it's a row house) that is beginning to crumble, with a section of bricks now missing. It's a very old house, so the bricks are soft and lime-based mortar was used.
My questions are:
Is replacing and mortaring the bricks a DIY job?
If I hire someone to do it, can they manage to work in my attic with the insulation in it (and will my insulation be ruined)?