Lol well there really isnt a diference when comin to backin in both performance and trail the only thing that is realy different is in trail you are goin over objects and things have to be more focused.
Just start slowly on the backin lesson still use the reins how you normal use them but just change your seatin and once he is goin good with that then start to loosen your reins till they are loose.
K with the "L" when backin maybe you could rig on up at home and practice there, just by you noing the steps for the horse, you could count when backin and then turn because you will no the steps in your head.
With the noodle reins, westurn is more bout comunicating with your horse with your legs and your body weight shiftin round, belive it or not and bearly touchin the reins.
Don't think any of your questions are silly you are just wantin to re-learn again and it is good that you are askin for help.