Photographers are important as the wedding pictures will be one of the lasting memories of the wedding ceremony and reception. It is important to choose a photographer carefully and to find one that you can work well with. Typical costs for a photographer will run between 9 to 14%
I'm a fan of MS Excel _ my apologies for those who have issues with Microsoft _ because I find its powerful calculations are easy to manipulate to help me better understand my finances. It doesn't really matter though which spreadsheeting package you use so long as you are able to calculate your amounts effectively. There are commercial budgeting worksheets available but if you want to create your own its a simple process.