For your wedding makeup, use a primer, long-lasting foundation and waterproof mascara. Try several different looks to see what you like best.
Keep an online database or spreadsheet with the names of all invitees and RSVPs. Use the same list to note gifts given and thank you notes written.
Make a list of everything you will need to bring with you on the big day. Gather everything in advance and put it in one spot so that you don't have to search for an essential item at the last minute.