To hide fields in the edit and newform pages for a list add the following Javascript to the top on the

default list pages using SPD 

 <script language="javascript" type="text/javascript">

_spBodyOnLoadFunctionNames.push("hideFields");

function findacontrol(FieldName) {

   var arr = document.getElementsByTagName("!");
   // get all comments
   for (var i=0;i < arr.length; i++ )
   {
      // now match the field name
      if (arr[i].innerHTML.indexOf(FieldName) > 0)
      {         return arr[i];      }
   }
}

function hideFields() {

   var control = findacontrol("Influence");
   control.parentNode.parentNode.style.display="none";
   control = findacontrol("Experience");
   control.parentNode.parentNode.style.display="none";
 
}
</script>

I always for get how to do this, and the  have to look it up when the dev box runs out of disk space.

backup log DBName with truncate_only