i find the easiest way to tie is to use tape and normal string. I cut a big piece of string loop it around the plant so that it is a "U" with the two ends in your hand. fiddle around and figure out the location you want to string to be tied and tape it down.
benifits - taping is easier than tying. its faster, easier and you would need to create a location to tie onto.
-once a branch has been taped for a while if you want to bend it lower of higher you just pull the string The tape will give way and allow the change in length. But grip back on when you press. so it's easy to modify your ties.
-keeps the string length to what you indended.
i have used the tying method and i found that once i tied the knot i often didn't tie it in the correct place and the plant was bent more or less than what i intended.
-LSTing is super fun and really easy, you can be very creative and it dosn't slow growth much if at all.