Use a flat pry bar and hammer to pry the nails out of the drip edge gently.
Overhang roof to gutter.
Greater overhang becomes a point of leverage for gusts of wind to rip off your roofing.
Gutters should be hung where a straight edge laying on your roof shingles can easily extend over the front lip of the gutter this is the proper installment location for the high point of the gutter.
Here phil explains how much overhang a roof should have at the gutter.
How to cut a gooseneck downpipe.
How far into the gutter should roof tiles project.
A typical metal roof overhang may be 2 to 4 inches or even less.
Some slight overhang is recommended in conjunction with a drip edge flashing to prevent water from getting under the roofing and onto underlying wood.
Metal is usually installed on rafters or strip sheathing rather than the solid decking used under other materials.
It can be done.
Gently lift up the shingles on the edge of the roof and locate the nails holding the existing drip edge onto.
In almost every instance gutter installers take the path of least resistance and shove the gutter right underneath the roof shingles instead.
In this video we demonstrate how to install a gutter for a shed metal roof or house.