Dental Implant; Do they numb that area in order to expose the post so I can go back to my dentist so he an put on the new tooth?

everytime that an incision needs to be made or stitches placed in the gums, the surgeon will use anaesthetic to numb the area. 

Most implants nowadays are inserted into the jawbone in a single-stage process whereby a second surgical intervention is unnecessary. However, some surgeons still practice a two stage procedure (old fashioned) OR a two stage process is at times indicated if bone grafting is done at the same time as the implant insertion and the area needs to be submerged beneath the gums to heal undisturbed. In that case, very little freezing will be required to set up the implant for the dentist to pace the final crown later 

It depends,  if a healing cap is not in place now and the implant is under the gum tissue , then yes, you usually will be anaesthisezed to expose the implant and place a healing cap