The general agreement of the group is that you don't. You get a
professional to do it. Someone who's done it before and has the
insurance to prove it.

Please do a usenet search before asking this question on r.a.t.s. - it
usually leads to a couple of crackpot answers, the odd reasonable
looking answer and a whole stream of the reasons why you shouldn't do
it.

In most situations you can get away without the effect with some
creative staging and lighting.