Learning the songs from tabs is much easier if u know the songs too well..then u will know when to change the pattern.
Of Course learnign the whole song in a day is not possible..
like zepplin stated.. cut them into parts..and learn them bit by bit practice till u smooth at the part..then change to the next part..that will do .But its better to know the songs well 1st then it will be an ease when learning tabs.
*Speed is nothing without control*