I think you probably need to expand your time line so that you can progress frame by frame.
Click on the + sign in the lower right corner of the time line. This will stretch out the time line and you can click it enough times that you can advance frame by frame by using the arrow keys. As mike said you really can’t get much more accurate than ‘frame accuracy’ You can see if it is advancing frame by frame by watching the counter in the lower right corner. You should see the frame cound advance one by one rather than a bunch at a time.