Been thinking about arranging an appt. with a local provider ... this would be my first time in the hobby and am a little apprehenisve about law enforcment.  The provider I am considering has some nice reviews on TER.  Should I feel confident that because she has been reviewed? Has any one ever known LE posting reviews just to help entrap customers?

The lady that you contacted has reviews if you are in doubt regarding her reviews contact some of the guys that reviewed her see what they say.I would also google her name,phone number,email,website,etc. and see if she is reviewed on other sites as well.If you are sticking with a well-reviewed lady there should be no problems.Good luck to you and have a great time.

However, you can see the history of each reviewer. Click on the hobbyist's handle and you can see all the ladies he has reviewed.  The more reviews a hobbyist has, the more you can normally rely on his review.
LE normally goes after the low hanging fruit. But remember, nothing in the hobby is a dead solid lock, it's the nature of the hobby

Yes, especially if she has more than one.  Also, rarely if ever does LE use undercover for OUTCALL.

The more history she has, the better. Ads posted over time, reviews posted over time etc.  A LE phony id is too likely to get outed to be worth maintaining over time....generally.   But, no guarantees.  Its illegal, no way to make it 100% safe.

Also, be aware if she asks you anything about what you want, is very open with the address immediately, if her pics both look real and like something a police woman wouldn't worry about having taken of herself...