I always had a problem if I had to dag any of the sheep, or look at their teats etc. as I often had no help
This is what I did - drive them into some sort of pen, and in the the corner of the pen, and about a bit more than a sheeps length from the corner tie a piece of baler twine to the gate in which you have made a loop (which cannot slip AT ALL) and the loop made large enough to fit over the sheeps head reasonably easily but not too loose
Manoeuvre the sheep to the chosen corner slip the loop over her head, and keep her back end towards the corner with you leaning on her side against the gate.
Doing it this way the sheep will try to run out from the corner and the loop will stop her going forward and you stop her going sideways plus the corner stops her going back and slipping her head out. Giving you the opportunity to do what needs to be done.
If you need to do the other side you need another loop in the opposite corner.
Its a useful trick if you need to do something and you are on your own, and not strong enough or fit enough to turn it over
All the best
Sue
Dark Brown Eggs