With the ears i clip as much as possible and then use scissors to trim the hairs coming out, but obviously dont go too deep as they need the protection! The willy can be completly clipped, just watch yourself as it can be very tickly! But once a horse has a full clip they do look very smart so...
Hiya i do alot of clipping of heads and there is usually a slight ring around the eye which u cant do alot about! I wouldnt use the trimmers as it does look silly with different lenghts of hair, dont worry everyone is in the same boat and roll on summer!