1. Ensure that your passport will have still have six months of validity when you RETURN from your upcoming visit;
2. If you have NEVER had a passport issued in your name give yourself at least three months lead time to obtain a passport. If you have the opportunity to expedite issuance of your new passport, my suggestion is to take advantage of the opportunity;
3. If you have less than six months remaining on your current passport my suggestion is that you obtain a NEW passport, as many embassies will not issue you a visa if you have less than six months remaining on your passport.