Chances are the nails that will be securely seated in the wood so a bit of force will be needed with a twisting motion of the roofing shovel or spade.
How to remove roof shingles yourself.
Secure loose boards and cover large holes.
Remove the shingles in layers as you work your way up the roof.
Replacement tear off 1.
Hammer down any boards or nails that have come loose ensuring the.
Remove shingles in a 2 to 3 ft wide section as you work down the roof.
Continue tearing off the shingles and underlayment until you reach the roof jacks then start over at the top of the roof.
Use a shingle scraper pitchfork or flat shovel to get under the shingles prying them up.