How do i assign character / paragraph styles automatically in word 2010

Hi, i’ve a 200 pg word document which is fully formatted. Unfortunately the person who had worked on it earlier has not assigned a single styles to it. He has done it manually. The formatting is very neat. Now its become my job to assign styles to each and every paragraph manually. I click on create new style based on the formatting and assigning the same style manually. Finding it very difficult to do it and I’m sure this can be done using some scripts. Any one can help me to come out of this problem?