Spain & Italy here we come!

We are less than a month away from our departure to Europe.  We are excited and nervous that we will forget something.  We trust that the advise from our friends and family will help us get through the planning and many details that we need to do before we leave.  Right not packing is a concern.  How do you pack light, but enough for such a long trip?  Will we have enough time to do what we planned for each day?  Lots to think about and lots to read before we leave.  For now  we will continue to listen and take all the advise and recommendations that any of you may have for us.