When it comes down to the last month of your planning (and when you're particularly harried) look at your mile long to-do list and cut three things. Yes, cut three things. Not crucial things you just don't feel like doing, such as picking a processional song or confirming final details with all of your vendors. Eliminate only the over-the-top tasks like hand-painting "Just Married" signs, or baking cookies for all of the welcome bags. Cross them off and make a pledge not to think about them again.
Pare down your guest list with the "tiers of priority" trick. Place immediate family, the bridal party and best friends on top of the list; follow with aunts, uncles, cousins and close friends you can't imagine celebrating without. Under that, list your parents' friends, neighbors, coworkers and so on. If you need to make some cuts, start from the bottom until you reach your ideal number.
How should I address my invitations? This can get pretty complex pretty quick! Generally, you address the envelopes to an entire family as one entity. You can list out the individual family members on the RSVP card if you feel clarification is needed. The same goes for couples, they receive one invitation addressed to both. Single people are given a nudge to bring a date by simply adding "plus guest" to the end of their name.