Step 7: Job done, wait for a rain storm for results.
I only replaced three shingles for this job, plus used roofing cement under a few more that were cracked.
Step 5: Don't rip the underlayment!
You want to leave the underlayment (tarpaper) intact. I tore the tarpaper here with my prybar, looking for a nail. It is very easy to tear 15# underlayment, which many commercial roofers use. Be sure any tears are repaired with the roofing cement.