FI and I have been arguing over when to move in together and we decided that I would ask the opinion of some married women on TK to find out what people who have gone through this before think. I might also post on TN.
Currently we don't live together but were planning on getting our own place in June. This would be 3 months before the wedding. FI wants to move in together 1 month before the wedding because it would save 2 months rent (about $1600 but it really isn't like it will hurt us to spend it either). I think we will have way too much going and and be way too stressed 1 month before the wedding to move. He thinks it will be just fine.