This tip is actually another one of John's. Don't we love it when he chimes in from time to time!
John says to not make any major decisions - like buying a dress, booking a venue, etc., the first week after you get engaged. Take a little time to enjoy your new sparkly ring. There is so much excitement right after an engagement, but don't let that excitement cause you to make bad decisions.
Booking the first venue you see, or the first dress you put on because you just sooooo excited and can't wait to start getting ready for the wedding, it might turn out to be a bad thing. Take the time to make an educated decision so that you won't have any regrets. I doubt many venues or dress shops will give you a refund if you change your mind.
And you know what else would help...hiring a professional wedding planner. They will be able to lead you in the right direction! AND save you money in the process!