This is not specific to poly, anyway, a great overview of what to consider beforehand and how to come out
https://www.youtube.com/watch?v=MJ-8ocmtb_8
The only big area relevant to poly I don't see discussed in the video are the specifics or coming out to your spouse and weighing the impact a possible divorce could have on children - the dilemma between responsibility and being true that some folks face it they suspect that their news won't be received well. Unfortunately, there's no easy how to for that...
https://www.youtube.com/watch?v=MJ-8ocmtb_8
The only big area relevant to poly I don't see discussed in the video are the specifics or coming out to your spouse and weighing the impact a possible divorce could have on children - the dilemma between responsibility and being true that some folks face it they suspect that their news won't be received well. Unfortunately, there's no easy how to for that...