I have never shot a shield, I do shoot an M&P FS 40 and 9mm Core... so cannot give you a specific answer to your question...

But, It would be good if you could borrow your in-laws 9mm for the course rather than buy one with this short notice.

The CPL test in Michigan (don't know how this compares with other states) doesn't require excellent shooting, around 100 rounds at 7 yards or so, hitting an 8x10 paper is good enough.

All you need to do is get through the course, then you can take your time and do a good job picking a firearm that works for you. The right firearm for you is important... much more than the right firearm for the course...

Just my $.02...

Will