Now there are two different kinds of binding, one is to limit a person's affect on you and the other is to limit them as an individual. The first is seen as defensive magic and generally more acceptable. It also depends on why you want to bind someone. If they are an all round bitch it might be more appropriate to target their actions in general. If however the problem is just between you and them, you may want to tackle the binding with regard to your relationship.
When I bind to limit a person in general the first thing I do is to place my representation inside a small circle of salt. Try to get the circle as unbroken as possible and visualise the circle creating a barrier that their negativity and spite cannot break through. I always articulate my intentions very clearly out loud, stipulating exactly what I am trying to achieve. With the person still in the small circle I have created I then physically bind my representation with thread (sometimes colour dependent but more often not) and then I seal them inside a bag and hang them on my spell tree.
If I'm doing the other kind of binding I put a piece of my own hair inside the circle and visualise the protective barrier protecting me from the offending individual. I then physically bind and wrap them outside the circle and again, hang them on my tree. (If it's a particularly malicious spell I might give them a squeeze or a pinch every now and then to reinvigorate the spell.)
Image http://www.sxc.hu/photo/905239 (LilGoldWmn)