Simple formula for backing TTs. Useing your mirrors, keep your hand at the 6 Oclock position. Whatever way you want your TT to go; move your hand that way.
IE: your looking in your RHS mirror and you want you TT to move in the rh direction. just move your hand towards (RHS) the mirror that the TT needs to go to. A point to remember; the longer the trailer the more time it takes to respond to you turning the wheel. As far as making turns; make sure that your TT wheels are at the apex of the turn, before turning. good luck