when do you order invitations?

How many months in advance do you order invitations? I found the ones I want to use, but I dunno how long I should wait to order them.

Thanks.

I'm not exactly sure..If you found the ones you love and you know you aren't going to change your mind, why not just order now to get it over with?? I constantly change my mind so I'd personally wait.. but if you aren't bi-polar like me...go for it!