First was my M&P FS40. Read the manual, followed the instructions, everything went smoothly. Next, the Shield40.
Same process, same results. Next, the M&P22. But, I apparently became an "expert" and didn't read about the differences before I tried to disassemble and clean it.
After inventing a few new words and thinking my manual
dexterity had completely abandoned me, I watched a few YouTube videos and "Read the Book". Once in awhile I don't know it all.
Keep the Shield, learn it and you'll appreciate it more and more.