Doing it now will make it easier to keep the reroofing job clean.
How to remove shingles roof.
Remove caps remove the ridge caps.
Push the shingles down to the roof jacks.
Allow the mixture to sit on the shingles for 15 minutes then rinse the roof well with water from the garden hose.
Place a pitchfork flat garden shovel or shingle scraper under the shingle.
Use a flat pry bar or roofing shovel to pry out and remove the ridge shingles.
Ensure that as you remove the shingles you are taking them from the roof and into the dumpster.
The shingles will roll up like a ball in front of the fork.
Pry the shingle from the roof.
Remove shingles in a 2 to 3 ft wide section as you work down the roof.
Remove the shingles in layers as you work your way up the roof.
This will keep the area clean as you progress toward the center of the roof.
Carefully place a ladder near the area of moss growth and don slip resistant shoes old clothes rubber gloves and eye.
Removing 3 tab shingles using a flat bar to do a repair.
You will want to start from one side of your roof and work your way to the other side.
To access the nails the shingle will need to be lifted but it is likely bonded to the shingle below by the shingles asphalt sealant spots.
Hose off and brush all moss loose from your roof shingles.
Set the nozzle at the highest pressure setting and hold it 12 inches from the shingles.
The nails in the shingle should come up with the shingle when you pry it off.
Continue tearing off the shingles and underlayment until you reach the roof jacks then start over at the top of the roof.