I am rebuilding an eave on my house and have gotten to the part where I need to figure out how to install the flashing. The eave goes around a corner and the flashing covers a 4" space between the eave and the roof. Also, the flashing runs along the main part of the edge and extends about a 1". The existing flashing is sheet lead and dates to 1910. Unfortunately it has deteriorated and needs to be replaced.
The problem is that the old flashing is nailed to the roof under the shingles. How do I get under them to remove the old flashing and attach the new flashing?