How far off is the wedding? It may be best to wait until afterwards.

If you plan to buy it beforehand, make sure it's a home each of you could afford on your own in case one of you loses your job or gets injured or you break up before you're legally married. Also if you're both getting the mortgage, get your credit scores and see if one or both of you has to work improving that in the months to come. No large purchases (new car, etc) in the months before and pay down any debt you or your partner has.